Update SMTP and SMTP_SSL docs for host/port

Author: Aniketsy

Doc/library/smtplib.rst

@@ -25,9 +25,10 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
 
    An :class:`SMTP` instance encapsulates an SMTP connection.  It has methods
    that support a full repertoire of SMTP and ESMTP operations.
-   If the host parameter is set to a truthy value, :meth:`SMTP.connect` is
-   called automatically when the object is created, otherwise :meth:`connect` must be
-   called manually.
+
+   If the host parameter is set to a truthy value, :meth:`SMTP.connect` is called with
+   host and port automatically when the object is created; otherwise, :meth:`connect` must
+   be called manually.
 
    If specified, *local_hostname* is used as the FQDN of the local host in the HELO/EHLO
    command.  Otherwise, the local hostname is found using
@@ -87,9 +88,11 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
    An :class:`SMTP_SSL` instance behaves exactly the same as instances of
    :class:`SMTP`. :class:`SMTP_SSL` should be used for situations where SSL is
    required from the beginning of the connection and using :meth:`SMTP.starttls` is
-   not appropriate. If the host parameter is set to a truthy value,
-   :meth:`SMTP.connect` is called automatically when the object is created,
-   otherwise :meth:`!SMTP.connect` must be called manually.
+   not appropriate.
+
+   If the host parameter is set to a truthy value, :meth:`SMTP.connect` is called with host
+   and port automatically when the object is created; otherwise, :meth:`connect` must
+   be called manually.
 
    The optional arguments *local_hostname*, *timeout* and *source_address* have the same
    meaning as they do in the :class:`SMTP` class.  *context*, also optional,
@@ -271,7 +274,8 @@ An :class:`SMTP` instance has the following methods:
    2-tuple of the response code and message sent by the server in its
    connection response.
 
-   If the port is not specified, the value of the :attr:`default_port` attribute is used.
+   If port is not changed from its default value of 0, the value of the :attr:`default_port`
+   attribute is used.
 
    .. audit-event:: smtplib.connect self,host,port smtplib.SMTP.connect