Linkify SMTP.quit() in smtplib documentation. (GH-9785)

(cherry picked from commit ba57963)

Co-authored-by: takey <[email protected]>

Author: miss-islington

Doc/library/smtplib.rst

@@ -41,7 +41,7 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
    the OS default behavior will be used.
 
    For normal use, you should only require the initialization/connect,
-   :meth:`sendmail`, and :meth:`~smtplib.quit` methods.
+   :meth:`sendmail`, and :meth:`SMTP.quit` methods.
    An example is included below.
 
    The :class:`SMTP` class supports the :keyword:`with` statement.  When used