[1.7.x] Fixed #24379 -- Documented that remote user example disables ModelBackend.
[1.7.x] Fixed #24379 -- Documented that remote user example disables ModelBackend.

Backport of 6b28e957df364532109a1897c73a1fa8b1416bd4 from master

oscaro/django,oscaro/django,oscaro/django,jyotsna1820/django,jyotsna1820/django,jyotsna1820/django,jyotsna1820/django,oscaro/django