[1.7.x] Removed non-existent reference to args/kwargs in manager docs.
[1.7.x] Removed non-existent reference to args/kwargs in manager docs.

Backport of 5842d8eba4 from master

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