Fix a warning

sobolevn · sobolevn · commit 86faf1059101 · 2024-02-02T09:45:33.000+03:00
diff --git a/Doc/howto/pyporting.rst b/Doc/howto/pyporting.rst
@@ -36,3 +36,6 @@ There are also multiple third-party guides that might be useful:
 - `PyCon 2020 tutorial <https://www.youtube.com/watch?v=JgIgEjASOlk>`_
 - `Guide by Digital Ocean <https://www.digitalocean.com/community/tutorials/how-to-port-python-2-code-to-python-3>`_
 - `Guide by ActiveState <https://www.activestate.com/blog/how-to-migrate-python-2-applications-to-python-3>`_
+
+
+.. _python-porting: https://mail.python.org/pipermail/python-porting/
