Fixes a typo in importlib.metadata. (GH-23921) (#24030)

Signed-off-by: Tao He <[email protected]>
(cherry picked from commit 3631d6d)

Co-authored-by: Tao He <[email protected]>

Co-authored-by: Tao He <[email protected]>

Author: miss-islington

Doc/library/importlib.metadata.rst

@@ -198,9 +198,9 @@ Thus, an alternative way to get the version number is through the
 There are all kinds of additional metadata available on the ``Distribution``
 instance::
 
-    >>> d.metadata['Requires-Python']  # doctest: +SKIP
+    >>> dist.metadata['Requires-Python']  # doctest: +SKIP
     '>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*'
-    >>> d.metadata['License']  # doctest: +SKIP
+    >>> dist.metadata['License']  # doctest: +SKIP
     'MIT'
 
 The full set of available metadata is not described here.  See :pep:`566`