Fixed malformed Sphinx directives.

docs/howto/deployment/checklist.txt

@@ -228,7 +228,7 @@ See :doc:`/topics/logging` for details on logging.
 
 See :doc:`/howto/error-reporting` for details on error reporting by email.
 
-.. admonition: Error reporting by email doesn't scale very well
+.. admonition:: Error reporting by email doesn't scale very well
 
     Consider using an error monitoring system such as Sentry_ before your
     inbox is flooded by reports. Sentry can also aggregate logs.

docs/topics/auth/default.txt

@@ -618,7 +618,7 @@ redirects to the login page::
             def test_func(self):
                 return self.request.user.email.endswith('@example.com')
 
-    .. admonition: Stacking UserPassesTestMixin
+    .. admonition:: Stacking ``UserPassesTestMixin``
 
         Due to the way ``UserPassesTestMixin`` is implemented, you cannot stack
         them in your inheritance list. The following does NOT work::

docs/topics/migrations.txt

@@ -333,7 +333,7 @@ Note that this only works given two things:
   that your database doesn't match your models, you'll just get errors when
   migrations try to modify those tables.
 
-.. versionchanged: 1.8
+.. versionchanged:: 1.8
 
     The ``--fake-initial`` flag to :djadmin:`migrate` was added. Previously,
     Django would always automatically fake-apply initial migrations if it