Fixed man page by ensuring ".pot" doesn't render unescaped.

See https://github.com/sphinx-doc/sphinx/issues/2131

docs/ref/django-admin.txt

@@ -645,7 +645,7 @@ for technically skilled translators to understand each message's context.
 .. django-admin-option:: --keep-pot
 
 Use the ``--keep-pot`` option to prevent Django from deleting the temporary
-.pot files it generates before creating the .po file. This is useful for
+``.pot`` files it generates before creating the .po file. This is useful for
 debugging errors which may prevent the final language files from being created.
 
 .. seealso::