Fixed #8848: clarified custom file storage backend docs in light of the more clear code comments.
Fixed #8848: clarified custom file storage backend docs in light of the more clear code comments.

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extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%408942

Belgabor/django,Belgabor/django,Belgabor/django