Fix Trailing white space

Author: rowanvil

Doc/whatsnew/2.6.rst

@@ -1182,7 +1182,7 @@ dictionary-style access.  The phrase "dictionary-style" is vague, however.
 It probably means that accessing items with ``obj[1]`` works.
 Does it imply that setting items with ``obj[2] = value`` works?
 Or that the object will have :meth:`!keys`, :meth:`!values`, and :meth:`!items`
-methods?  What about the iterative variants  such as :meth:`!iterkeys`?  
+methods?  What about the iterative variants  such as :meth:`!iterkeys`? 
 :meth:`!copy`and :meth:`!update`?  Iterating over the object with :func:`!iter`?
 
 The Python 2.6 :mod:`collections` module includes a number of