#6841: remove duplicated word.

Doc/library/stdtypes.rst

@@ -2061,7 +2061,7 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
 
       :func:`update` accepts either another dictionary object or an iterable of
       key/value pairs (as a tuple or other iterable of length two).  If keyword
-      arguments are specified, the dictionary is then is updated with those
+      arguments are specified, the dictionary is then updated with those
       key/value pairs: ``d.update(red=1, blue=2)``.
 
       .. versionchanged:: 2.4