[1.0.X] Fixed #10981 -- Clarified documentation regarding lazy...

[1.0.X] Fixed #10981 -- Clarified documentation regarding lazy cross-application relationships. Thanks to Ramiro for the suggestion.

Merge of r10971 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10974 bcc190cf-cafb-0310-a4f2-bffc1f526a37