Fixed wrong link to Telnet.open() method in telnetlib documentation.
.. class:: Telnet(host=None, port=0[, timeout])
:class:`Telnet` represents a connection to a Telnet server. The instance is
- initially not connected by default; the :meth:`open` method must be used to
+ initially not connected by default; the :meth:`~Telnet.open` method must be used to
establish a connection. Alternatively, the host name and optional port
number can be passed to the constructor too, in which case the connection to
the server will be established before the constructor returns. The optional