docs: fix syntax highlighting of code blocks

And various other cleanups

Change-Id: I240badc5358c09f006c2a22d4706ce373f2dd188
diff --git a/docs/release-notes/release-notes-0.6.0.rst b/docs/release-notes/release-notes-0.6.0.rst
index 1c33eea..34e44e3 100644
--- a/docs/release-notes/release-notes-0.6.0.rst
+++ b/docs/release-notes/release-notes-0.6.0.rst
@@ -91,8 +91,8 @@
 
 - Fix potential misaligned memory accesses (:issue:`4191`)
 
-Deletions
-^^^^^^^^^
+Removals
+^^^^^^^^
 
 - Deprecated code, including ``faces/enable-local-control`` and ``faces/disable-local-control``
   management commands (:issue:`3988`)