Fixed broken link in docs/django-admin.txt

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6077 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/django-admin.txt

@@ -143,7 +143,7 @@ Example usage::
 
     django-admin.py dumpdata --format=xml
 
-.. _Serialization formats: ../serialization/#Serialization-formats
+.. _Serialization formats: ../serialization/#serialization-formats
 
 --indent
 ~~~~~~~~