Emacs generally follows the GNU coding standards when it comes to ChangeLogs:
http://www.gnu.org/prep/standards/html_node/Change-Logs.html
-One exception is that we still quote `like-this' (as the standards
-used to recommend) rather than 'like-this' (as they do now),
+One exception is that we still sometimes quote `like-this' (as the
+standards used to recommend) rather than 'like-this' (as they do now),
because `...' is so widely used elsewhere in Emacs.
http://lists.gnu.org/archive/html/emacs-devel/2014-05/msg00514.html