Fix markup

Author: mnaberez

CHANGES.rst

@@ -2,7 +2,7 @@
 -------------------------
 
 - Fixed a bug on Python 3 where a network error could cause ``supervisord``
-  to crash with the error ``<class 'TypeError'>:can't concat str to bytes ``.
+  to crash with the error ``<class 'TypeError'>:can't concat str to bytes``.
   Patch by Vinay Sajip.
 
 - Fixed a bug where a test would fail on systems with glibc 2.3.1 because