Fix typo in changelog

CHANGES.txt

@@ -42,7 +42,7 @@
 - Errors caused by bad values in a config file now show the config section
   to make debugging easier.  Patch by Marc Abramowitz.
 
-- Setting ``redirect_stderr=true`` in an `[eventlistener:x]`` section is now
+- Setting ``redirect_stderr=true`` in an ``[eventlistener:x]`` section is now
   disallowed because any messages written to ``stderr`` would interfere
   with the eventlistener protocol on ``stdout``.