docs: close paragraphs before lists

paragraphs can't contain lists, and attempting to close them after
the list just cause an extra, empty paragraph to be created. We don't
want that, so let's close the paragraphs before the list intead.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

docs/devinfo.html

@@ -25,6 +25,7 @@
 
 <p>
 To add a new GL extension to Mesa you have to do at least the following.
+</p>
 
 <ul>
 <li>
@@ -73,7 +74,6 @@ To add a new GL extension to Mesa you have to do at least the following.
    tests are run using 'meson test'
 </li>
 </ul>
-</p>