Add new email.policy document to the toctree and fix markup glitch.
diff --git a/Doc/library/email.rst b/Doc/library/email.rst
index 4530b95..fc206f4 100644
--- a/Doc/library/email.rst
+++ b/Doc/library/email.rst
@@ -51,6 +51,7 @@
    email.message.rst
    email.parser.rst
    email.generator.rst
+   email.policy.rst
    email.mime.rst
    email.header.rst
    email.charset.rst