Fixed #8373 -- Corrected a bad link in the admin.txt documentation. Thanks jarrow for catching my mistake.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8422 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/admin.txt

@@ -79,8 +79,6 @@ add/change pages.
 
 For an example see the section `Adding custom validation to the admin`_.
 
-.. _Adding custom validation to the admin: #adding-custom-validation-to-the-admin
-
 ``fieldsets``
 ~~~~~~~~~~~~~