docs: Update release notes with current process

There's a lot of stuff here that's out of date, update it to something
more modern.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4066>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4066>

docs/releasing.html

@@ -23,7 +23,6 @@
 <li><a href="#pickntest">Cherry-pick and test</a>
 <li><a href="#stagingbranch">Staging branch</a>
 <li><a href="#branch">Making a branchpoint</a>
-<li><a href="#prerelease">Pre-release announcement</a>
 <li><a href="#release">Making a new release</a>
 <li><a href="#announce">Announce the release</a>
 <li><a href="#gitlab">Update Gitlab Issues</a>
@@ -74,16 +73,11 @@ on the mesa-announce@ mailing list.
 <li>Typically, the final release will happen after 4
 candidates. Additional ones may be needed in order to resolve blocking
 regressions, though.
-<li>A <a href="#prerelease">pre-release</a> announcement should be available
-approximately 24 hours before the final (non-rc) release.
-</ul>
 
 <h2>Stable releases</h2>
 <ul>
 <li>Normally available once every two weeks.
 <li>Only the latest branch has releases. See note below.
-<li>A <a href="#prerelease">pre-release</a> announcement should be available
-approximately 48 hours before the actual release.
 </ul>
 
 <p>
@@ -113,20 +107,24 @@ described in the same section.
 </p>
 
 <p>
-Nomination happens in the mesa-stable@ mailing list. However,
+Nominations happen via special tags in the commit messages, and via gitlab
-maintainer is responsible of checking for forgotten candidates in the
+merge requests against the staging branches. There are special scripts used
-master branch. This is achieved by a combination of ad-hoc scripts and
+to read the tags.
-a casual search for terms such as regression, fix, broken and similar.
 </p>
 
 <p>
-Maintainer is also responsible for testing in various possible permutations of
+The maintainer should watch or be in contact with the Intel CI team, as well
-the meson and scons build.
+as watch the gitlab CI for regressions.
 </p>
 
-<h2>Cherry-picking and build/check testing</h2>
+<p>
+Cherry picking should be done with the '-x' switch (to automatically add
+"cherry picked from ..." to the commit message):
+</p>
 
-<p>Done continuously up-to the <a href="#prerelease">pre-release</a> announcement.</p>
+<code>
+git cherry-pick -x abcdef12345667890
+</code>
 
 <p>
 Developers can request, <em>as an exception</em>, patches to be applied up-to
@@ -141,20 +139,7 @@ well contained. Thus it cannot affect more than one driver/subsystem.
 <li><em>AMD team</em>
 </ul>
 
-<p>The following must pass:</p>
+<p>The gitlab CI must pass.</p>
-<ul>
-<li>meson test, scons and scons check
-<li>Testing with different version of system components - LLVM and others is also
-performed where possible.
-<li>As a general rule, testing with various combinations of configure
-switches, depending on the specific patchset.
-</ul>
-
-<p>
-These are achieved by combination of <a href="basictesting">local testing</a>,
-which includes mingw-w64 cross compilation and AppVeyor plus Travis-CI, the
-latter two as part of their Github integration.
-</p>
 
 <p>
 For Windows related changes, the main contact point is Brian
@@ -178,10 +163,6 @@ fix(es), then they should be squashed together. The commit messages and the
 &quot;<code>cherry picked from</code>&quot;-tags must be preserved.
 </p>
 
-<p>
-This should be noted in the <a href="#prerelease">pre-announce</a> email.
-</p>
-
 <pre>
 git show b10859ec41d09c57663a258f43fe57c12332698e
 
@@ -208,27 +189,12 @@ Date:   Wed Mar 1 18:11:10 2017 +0100
 
 <h2>Regression/functionality testing</h2>
 
-<p>
-Less often (once or twice), shortly before the pre-release announcement.
-Ensure that testing is redone if Intel devs have requested an exception, as per above.
-</p>
-
 <ul>
 <li><em>no regressions should be observed for Piglit/dEQP/CTS/Vulkan on Intel platforms</em>
 <li><em>no regressions should be observed for Piglit using the swrast, softpipe
 and llvmpipe drivers</em>
 </ul>
 
-<p>
-Currently testing is performed courtesy of the Intel OTC team and their Jenkins CI setup. Check with the Intel team over IRC how to get things setup.
-</p>
-
-<p>
-Installing the built driver from the pre-announced RC branch in the
-system and making some every day's use until the release may be a good
-idea too.
-</p>
-
 <h2 id="stagingbranch">Staging branch</h2>
 
 <p>
@@ -277,8 +243,8 @@ git checkout -b X.Y
 git checkout master
 $EDITOR VERSION # bump the version number
 git commit -as
-cp docs/relnotes/{X.Y,X.Y+1}.html # copy/create relnotes template
+truncate docs/relnotes/new_features.txt
-git commit -as
+git commit -a
 git push origin X.Y-branchpoint X.Y
 </pre>
 
@@ -293,162 +259,6 @@ For example: files being overwritten on install, etc. Happens extremely rarely -
 we had only one case so far (see commit 2ced8eb136528914e1bf4e000dea06a9d53c7e04).
 </p>
 
-<p>
-Proceed to <a href="#release">release</a> -rc1.
-</p>
-
-
-<h2 id="prerelease">Pre-release announcement</h2>
-
-<p>
-It comes shortly after outstanding patches in the respective branch are pushed.
-Developers can check, in brief, what's the status of their patches. They,
-alongside very early testers, are strongly encouraged to test the branch and
-report any regressions.
-</p>
-<p>
-It is followed by a brief period (normally 24 or 48 hours) before the actual
-release is made.
-</p>
-
-<p>
-Be aware to add a note to warn about a final release in a series, if
-that is the case.
-</p>
-
-<h2>Terminology used</h2>
-
-<ul><li>Nominated</ul>
-
-<p>
-Patch that is nominated but yet to to merged in the patch queue/branch.
-</p>
-
-<ul><li>Queued</ul>
-
-<p>
-Patch is in the queue/branch and will feature in the next release.
-Barring reported regressions or objections from developers.
-</p>
-
-<ul><li>Rejected</ul>
-
-<p>
-Patch does not fit the
-<a href="submittingpatches.html#criteria" target="_parent">criteria</a> and
-is followed by a brief information. The release maintainer is human so if you
-believe you've spotted a mistake do let them know.
-</p>
-
-<h2>Format/template</h2>
-<pre>
-Subject: [ANNOUNCE] Mesa X.Y.Z release candidate
-To: mesa-announce@...
-Cc: mesa-dev@...
-
-Hello list,
-
-The candidate for the Mesa X.Y.Z is now available. Currently we have:
- - NUMBER queued
- - NUMBER nominated (outstanding)
- - and NUMBER rejected patches
-
-[If applicable:
-Note: this is the final anticipated release in the SERIES series. Users are
-encouraged to migrate to the NEXT_SERIES series in order to obtain future fixes.]
-
-BRIEF SUMMARY OF CHANGES
-
-Take a look at section "Mesa stable queue" for more information.
-
-
-Testing reports/general approval
---------------------------------
-Any testing reports (or general approval of the state of the branch) will be
-greatly appreciated.
-
-The plan is to have X.Y.Z this DAY (DATE), around or shortly after TIME.
-
-If you have any questions or suggestions - be that about the current patch
-queue or otherwise, please go ahead.
-
-
-Trivial merge conflicts
------------------------
-List of commits where manual intervention was required.
-Keep the authors in the CC list.
-
-commit SHA
-Author: AUTHOR
-
-    COMMIT SUMMARY
-
-    CHERRY PICKED FROM
-
-
-For example:
-
-commit 990f395e007c3204639daa34efc3049f350ee819
-Author: Emil Velikov &lt;emil.velikov@collabora.com&gt;
-
-    anv: automake: cleanup the generated json file during make clean
-
-    (cherry picked from commit 8df581520a823564be0ab5af7dbb7d501b1c9670)
-
-
-Cheers,
-Emil
-
-
-Mesa stable queue
------------------
-
-Nominated (NUMBER)
-==================
-
-AUTHOR (NUMBER):
-      SHA     COMMIT SUMMARY
-
-For example:
-
-Dave Airlie (1):
-      2de85eb radv: fix texturesamples to handle single sample case
-
-
-Queued (NUMBER)
-===============
-
-AUTHOR (NUMBER):
-      COMMIT SUMMARY
-[If applicable:
-Squashed with
-      COMMIT SUMMARY]
-
-For example:
-
-Jonas Pfeil (1):
-      ralloc: Make sure ralloc() allocations match malloc()'s alignment.
-Squashed with
-      ralloc: don't leave out the alignment factor
-
-
-Rejected (NUMBER)
-=================
-
-AUTHOR (NUMBER):
-      SHA     COMMIT SUMMARY
-
-Reason: ...
-
-For example:
-
-Emil Velikov (1)
-      a39ad18 configure.ac: honour LLVM_LIBDIR when linking against LLVM
-
-Reason: The patch was reverted shortly after it was merged.
-</pre>
-
-
 <h2 id="release">Making a new release</h2>
 
 <p>
@@ -466,8 +276,7 @@ relevant branch.
 
 <p>
 Most of the testing should already be done during the
-<a href="#pickntest">cherry-pick</a> and
+<a href="#pickntest">cherry-pick</a>
-<a href="#prerelease">pre-announce</a> stages.
 So we do a quick 'touch test'
 </p>
 
@@ -521,13 +330,11 @@ unset VK_ICD_FILENAMES
 <p>
 The release notes are completely generated by the
 <code>bin/gen_release_notes.py</code> script. Simply run this script before
-bumping the version
+bumping the version, and commit the results.
 
 The only thing left to do is add the sha256 sums.
 </p>
 
-<h3>Update version in file VERSION</h3>
-
 <p>
 Increment the version contained in the file VERSION at Mesa's top-level, then
 commit this change.
@@ -549,8 +356,6 @@ Start the release process.
 </p>
 
 <pre>
-# For the dist/distcheck, you may want to specify which LLVM to use:
-# export LLVM_CONFIG=/usr/lib/llvm-3.9/bin/llvm-config
 ../relative/path/to/release.sh . # append --dist if you've already done distcheck above
 </pre>
 
@@ -562,7 +367,7 @@ and SSH passphrase(s) to sign and upload the files, respectively.
 <h3>Add the sha256sums to the release notes</h3>
 
 <p>
-Edit docs/relnotes/X.Y.Z.html to add the sha256sums as available in the mesa-X.Y.Z.announce template. Commit this change.
+Edit docs/relnotes/X.Y.Z.html to add the sha256sum as available in the mesa-X.Y.Z.announce template. Commit this change.
 </p>
 
 <h3>Back on mesa master, add the new release notes into the tree</h3>
@@ -578,7 +383,8 @@ git cherry-pick -x X.Y
 
 <p>Then run the <code>./bin/post_verison.py X.Y.Z</code>, where X.Y.Z is the
 version you just made. This will updated docs/relnotes.html and
-docs/index.html. Remove docs/release-calendar.html. Then commit and push:
+docs/index.html. Remove the new release from docs/release-calendar.html. Then
+commit and push:
 </p>
 
 <pre>