#9562: slight clarification.

Doc/library/stdtypes.rst

@@ -2157,7 +2157,7 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
       existing keys.  Return ``None``.
 
       :meth:`update` accepts either another dictionary object or an iterable of
-      key/value pairs (as a tuple or other iterable of length two).  If keyword
+      key/value pairs (as tuples or other iterables of length two).  If keyword
       arguments are specified, the dictionary is then updated with those
       key/value pairs: ``d.update(red=1, blue=2)``.