Clarified and expanded documentation for Manager.use_for_related_fields.
Clarified and expanded documentation for Manager.use_for_related_fields.

This is for Manager subclasses that are default managers, but only
sometimes.  The general rule is: "don't use it." If you really need it,
read the instructions.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10057 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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extra : convert_revision : e4d494d7d03126a3c9db610f6e476c1d895cebc4

heracek/django-nonrel,adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel,heracek/django-nonrel,heracek/django-nonrel