Fixed two broken links introduced in recent commits.

docs/index.txt

@@ -181,7 +181,6 @@ testing of Django applications:
   :doc:`Overview <howto/deployment/index>` |
   :doc:`WSGI servers <howto/deployment/wsgi/index>` |
   :doc:`FastCGI/SCGI/AJP <howto/deployment/fastcgi>` |
-  :doc:`Apache authentication <howto/apache-auth>` |
   :doc:`Handling static files <howto/static-files>` |
   :doc:`Tracking code errors by email <howto/error-reporting>`
 

docs/topics/auth.txt

@@ -1921,7 +1921,7 @@ custom profile fields.
 Custom users and the built-in auth forms
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-As you may expect, built-in Django's :ref:`forms <_built-in-auth-forms>`
+As you may expect, built-in Django's :ref:`forms <built-in-auth-forms>`
 and :ref:`views <other-built-in-views>` make certain assumptions about
 the user model that they are working with.