comma nit

Doc/whatsnew/whatsnew24.tex

@@ -1041,7 +1041,7 @@ the name \samp{None} is now a syntax error.
 
 \item The inner loops for list and tuple slicing
  were optimized and now run about one-third faster.  The inner loops
- for dictionaries were also optimized , resulting in performance boosts for
+ for dictionaries were also optimized, resulting in performance boosts for
  \method{keys()}, \method{values()}, \method{items()},
  \method{iterkeys()}, \method{itervalues()}, and \method{iteritems()}.
  (Contributed by Raymond Hettinger.)