docs: renderpass -> render pass

This is how it's written in the Vulkan spec, let's follow that.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29879>

docs/drivers/freedreno.rst

@@ -628,7 +628,7 @@ the cases where stale data is read.
   ``cmdbuf``
     stomp registers at the start of each command buffer.
   ``renderpass``
-    stomp registers before each renderpass.
+    stomp registers before each render pass.
   ``inverse``
     changes ``TU_DEBUG_STALE_REGS_RANGE`` meaning to
     "regs that should NOT be stomped".

docs/drivers/zink.rst

@@ -300,9 +300,9 @@ variable:
   ``gpl``
     Force using Graphics Pipeline Library for all shaders
   ``rp``
-    Enable renderpass optimizations (for tiling GPUs)
+    Enable render pass optimizations (for tiling GPUs)
   ``norp``
-    Disable renderpass optimizations (for tiling GPUs)
+    Disable render pass optimizations (for tiling GPUs)
   ``map``
     Print info about mapped VRAM
   ``flushsync``