Corrected User model docstring about required fields.
Corrected User model docstring about required fields.

Follow up to 841a87785a78cc37362a66856025bae2f7ba633c.
claudep/django,adamchainz/django,ghickman/django,django/django,fenginx/django,manhhomienbienthuy/django,solarissmoke/django,charettes/django,fenginx/django,treyhunner/django,takis/django,wkschwartz/django,adamchainz/django,georgemarshall/django,elena/django,googleinterns/django,kaedroho/django,atul-bhouraskar/django,claudep/django,koordinates/django,elena/django,blighj/django,theo-l/django,simonw/django,ghickman/django,claudep/django,jpic/django,googleinterns/django,apollo13/django,auvipy/django,ghickman/django,EmadMokhtar/Django,simonw/django,auvipy/django,atul-bhouraskar/django,charettes/django,theo-l/django,manhhomienbienthuy/django,blighj/django,blighj/django,django/django,georgemarshall/django,freakboy3742/django,pauloxnet/django,wkschwartz/django,treyhunner/django,monetate/django,simonw/django,rsalmaso/django,adamchainz/django,felixxm/django,MarkusH/django,solarissmoke/django,dsanders11/django,koordinates/django,jpic/django,georgemarshall/django,felixxm/django,frankvdp/django,apollo13/django,takis/django,pauloxnet/django,kaedroho/django,EmadMokhtar/Django,elena/django,solarissmoke/django,frankvdp/django,simonw/django,apollo13/django,wkschwartz/django,auvipy/django,rsalmaso/django,georgemarshall/django,freakboy3742/django,takis/django,googleinterns/django,timgraham/django,timgraham/django,theo-l/django,schinckel/django,dsanders11/django,django/django,schinckel/django,pauloxnet/django,koordinates/django,adamchainz/django,django/django,dsanders11/django,takis/django,jpic/django,monetate/django,elena/django,charettes/django,shaib/django,manhhomienbienthuy/django,schinckel/django,pauloxnet/django,MarkusH/django,monetate/django,claudep/django,timgraham/django,rsalmaso/django,atul-bhouraskar/django,auvipy/django,shaib/django,shaib/django,jpic/django,MarkusH/django,treyhunner/django,schinckel/django,googleinterns/django,ghickman/django,shaib/django,theo-l/django,solarissmoke/django,apollo13/django,koordinates/django,atul-bhouraskar/django,dsanders11/django,monetate/django,kaedroho/django,wkschwartz/django,rsalmaso/django,charettes/django,blighj/django,felixxm/django,treyhunner/django,frankvdp/django,freakboy3742/django,fenginx/django,manhhomienbienthuy/django,fenginx/django,MarkusH/django,timgraham/django,EmadMokhtar/Django,felixxm/django,frankvdp/django