Fix external links to docs.python.org to use internal links instead.
diff --git a/Doc/howto/pyporting.rst b/Doc/howto/pyporting.rst
index b997df7..0452733 100644
--- a/Doc/howto/pyporting.rst
+++ b/Doc/howto/pyporting.rst
@@ -39,7 +39,9 @@
With that done, your options are:
-* If you are dropping Python 2 support, use 2to3_ to port to Python 3
+* If you are dropping Python 2 support, use :ref:`2to3 <2to3-reference>` to port
+ to Python 3
+
* If you are keeping Python 2 support, then start writing Python 2/3-compatible
code starting **TODAY**
@@ -601,8 +603,6 @@
please email the python-porting_ mailing list.
-
-.. _2to3: https://docs.python.org/2/library/2to3.html
.. _3to2: https://pypi.python.org/pypi/3to2
.. _Cheeseshop: PyPI_
.. _coverage: https://pypi.python.org/pypi/coverage