Remove nitpick_ignore no longer needed.

Author: jaraco

docs/conf.py

@@ -65,7 +65,6 @@
     # Workaround for #316
     ('py:class', 'importlib_metadata.EntryPoints'),
     ('py:class', 'importlib_metadata.PackagePath'),
-    ('py:class', 'importlib_metadata.PathDistribution'),
     ('py:class', 'importlib_metadata.SelectableGroups'),
     ('py:class', 'importlib_metadata._meta._T'),
     # Workaround for #435