docs: fix syntax highlighting of code blocks

And various other cleanups

Change-Id: I240badc5358c09f006c2a22d4706ce373f2dd188
diff --git a/docs/release-notes/release-notes-0.5.1.rst b/docs/release-notes/release-notes-0.5.1.rst
index 795b2a6..33dff3e 100644
--- a/docs/release-notes/release-notes-0.5.1.rst
+++ b/docs/release-notes/release-notes-0.5.1.rst
@@ -3,7 +3,7 @@
 
 Release date: January 25, 2017
 
-Changes since version 0.5.0
+Changes since version 0.5.0:
 
 New features
 ^^^^^^^^^^^^
@@ -98,8 +98,8 @@
   list`` and ``nfdc status report xml``. The argument-less ``nfd-status`` is retained as an
   alias of ``nfdc status report`` (:issue:`3780`)
 
-Deletions
-^^^^^^^^^
+Removals
+^^^^^^^^
 
 - Delete deprecated ``Strategy::sendInterest`` overload and ``violatesScope`` (:issue:`1756`,
   :issue:`3841`)