[1.7.x] Removed doc note about PasswordResetForm requiring an integer PK.
[1.7.x] Removed doc note about PasswordResetForm requiring an integer PK.

This limitation was lifted in refs #14881.

Backport of a7aaabfaf1fa4c20065ab1133d49f40d4de6b409 from master

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