Add new email.policy document to the toctree and fix markup glitch.

Doc/library/email.policy.rst

@@ -27,7 +27,7 @@ defaults are described below.  The :mod:`policy` module also provides some
 pre-created :class:`Policy` instances.  In addition to a :const:`default`
 instance, there are instances tailored for certain applications.  For example
 there is an :const:`SMTP` :class:`Policy` with defaults appropriate for
-generating output to be sent to an SMTP server.  These are listed :ref:`below
+generating output to be sent to an SMTP server.  These are listed `below
 <Policy Instances>`.
 
 In general an application will only need to deal with setting the policy at the

Doc/library/email.rst

@@ -51,6 +51,7 @@ Contents of the :mod:`email` package documentation:
    email.message.rst
    email.parser.rst
    email.generator.rst
+   email.policy.rst
    email.mime.rst
    email.header.rst
    email.charset.rst