Cosmetic smtplib changes (GH-8718)



Some cosmetic smtplib changes here. Let me know if you'd like a bpo/news entry or splitting this PR into two.

Automerge-Triggered-By: @maxking
diff --git a/Doc/library/smtplib.rst b/Doc/library/smtplib.rst
index a88e358..b3cc603 100644
--- a/Doc/library/smtplib.rst
+++ b/Doc/library/smtplib.rst
@@ -279,9 +279,10 @@
    response for ESMTP option and store them for use by :meth:`has_extn`.
    Also sets several informational attributes: the message returned by
    the server is stored as the :attr:`ehlo_resp` attribute, :attr:`does_esmtp`
-   is set to true or false depending on whether the server supports ESMTP, and
-   :attr:`esmtp_features` will be a dictionary containing the names of the
-   SMTP service extensions this server supports, and their parameters (if any).
+   is set to ``True`` or ``False`` depending on whether the server supports
+   ESMTP, and :attr:`esmtp_features` will be a dictionary containing the names
+   of the SMTP service extensions this server supports, and their parameters
+   (if any).
 
    Unless you wish to use :meth:`has_extn` before sending mail, it should not be
    necessary to call this method explicitly.  It will be implicitly called by