Closes #16789: :meth:quit links to constants instead of own module

Doc/library/ftplib.rst

@@ -370,10 +370,10 @@ followed by ``lines`` for the text version or ``binary`` for the binary version.
 .. method:: FTP.close()
 
    Close the connection unilaterally.  This should not be applied to an already
-   closed connection such as after a successful call to :meth:`quit`.  After this
-   call the :class:`FTP` instance should not be used any more (after a call to
-   :meth:`close` or :meth:`quit` you cannot reopen the connection by issuing
-   another :meth:`login` method).
+   closed connection such as after a successful call to :meth:`~FTP.quit`.
+   After this call the :class:`FTP` instance should not be used any more (after
+   a call to :meth:`close` or :meth:`~FTP.quit` you cannot reopen the
+   connection by issuing another :meth:`login` method).
 
 
 FTP_TLS Objects

Doc/library/poplib.rst

@@ -102,7 +102,7 @@ An :class:`POP3` instance has the following methods:
 .. method:: POP3.pass_(password)
 
    Send password, response includes message count and mailbox size. Note: the
-   mailbox on the server is locked until :meth:`quit` is called.
+   mailbox on the server is locked until :meth:`~poplib.quit` is called.
 
 
 .. method:: POP3.apop(user, secret)

Doc/library/smtplib.rst

@@ -32,7 +32,8 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
    setting will be used).
 
    For normal use, you should only require the initialization/connect,
-   :meth:`sendmail`, and :meth:`quit` methods.  An example is included below.
+   :meth:`sendmail`, and :meth:`~smtplib.quit` methods.
+   An example is included below.
 
    .. versionchanged:: 2.6
       *timeout* was added.