(Rather than anything involving "ditto" and suchlike.)
+- 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 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
+
** Unnecessary metainformation
There is no need to make separate change log entries for files such as