Fix typo in whatsnew

Doc/whatsnew/2.6.rst

@@ -734,7 +734,8 @@ and it also supports the ``b''`` notation.
 
 There's also a ``__future__`` import that causes all string literals
 to become Unicode strings.  This means that ``\u`` escape sequences 
-can be used to include Unicode characters.
+can be used to include Unicode characters::
+
 
     from __future__ import unicode_literals
 
@@ -744,6 +745,7 @@ can be used to include Unicode characters.
     print len(s)               # 12 Unicode characters
 
 
+
 .. seealso::
 
    :pep:`3112` - Bytes literals in Python 3000