gh-93851: Fix all broken links in Doc/ (GH-93853)

Author: arhadthedev

docs/using.rst

@@ -132,7 +132,7 @@ Inspect the resolved entry point::
 The ``group`` and ``name`` are arbitrary values defined by the package author
 and usually a client will wish to resolve all entry points for a particular
 group.  Read `the setuptools docs
-<https://setuptools.readthedocs.io/en/latest/setuptools.html#dynamic-discovery-of-services-and-plugins>`_
+<https://setuptools.pypa.io/en/latest/userguide/entry_point.html>`_
 for more information on entry points, their definition, and usage.
 
 *Compatibility Note*