Backport source links from 3.x.
Existing links have been updated to use the new reST role. In some
files, I have also made cosmetic changes to the header.
diff --git a/Doc/library/telnetlib.rst b/Doc/library/telnetlib.rst
index 925eccc..f6340a9 100644
--- a/Doc/library/telnetlib.rst
+++ b/Doc/library/telnetlib.rst
@@ -1,4 +1,3 @@
-
:mod:`telnetlib` --- Telnet client
==================================
@@ -9,6 +8,10 @@
.. index:: single: protocol; Telnet
+**Source code:** :source:`Lib/telnetlib.py`
+
+--------------
+
The :mod:`telnetlib` module provides a :class:`Telnet` class that implements the
Telnet protocol. See :rfc:`854` for details about the protocol. In addition, it
provides symbolic constants for the protocol characters (see below), and for the