bpo-33071: remove outdated PyPI docs (GH-13087)

Patch by Kojo Idrissa.
diff --git a/Doc/distutils/setupscript.rst b/Doc/distutils/setupscript.rst
index a65a26a..1f99f62 100644
--- a/Doc/distutils/setupscript.rst
+++ b/Doc/distutils/setupscript.rst
@@ -612,9 +612,8 @@
     provided, distutils lists it as the author in :file:`PKG-INFO`.
 
 (4)
-    The ``long_description`` field is used by PyPI when you are
-    :ref:`registering <package-register>` a package, to
-    :ref:`build its home page <package-display>`.
+    The ``long_description`` field is used by PyPI when you publish a package,
+    to build its project page.
 
 (5)
     The ``license`` field is a text indicating the license covering the