Merge pull request #1489 from nerdoc/patch-1

link to setuptools doc

docs/pkg_resources.txt

@@ -703,7 +703,7 @@ entry point group and look for entry points named "pre_process" and
 To advertise an entry point, a project needs to use ``setuptools`` and provide
 an ``entry_points`` argument to ``setup()`` in its setup script, so that the
 entry points will be included in the distribution's metadata.  For more
-details, see the ``setuptools`` documentation.  (XXX link here to setuptools)
+details, see the [``setuptools`` documentation](https://setuptools.readthedocs.io/en/latest/setuptools.html#dynamic-discovery-of-services-and-plugins).
 
 Each project distribution can advertise at most one entry point of a given
 name within the same entry point group.  For example, a distutils extension