custom-users-and-signals docs out of date

[Tom V]

The ​Custom users and signals docs say:

Another limitation of custom User models is that you can’t use django.contrib.auth.get_user_model() as the sender or target of a signal handler. Instead, you must register the handler with the resulting User model. See Signals for more information on registering and sending signals.

Which isn't really helpful, as you can now use the model label, as mentioned higher on the page:

post_save.connect(post_save_receiver, sender=settings.AUTH_USER_MODEL)

So maybe just remove the quoted para? (it was created in this ticket, 2 years ago, when passing models by label wasn't allowed yet)

Happy to create a patch once we're decided.

[Tim Graham <timograham@…>]

In 8e86d9d:

Fixed #24780 -- Removed outdated discussion of signals and custom users.

[Tim Graham <timograham@…>]

In d92eaeb:

[1.7.x] Fixed #24780 -- Removed outdated discussion of signals and custom users.

Backport of 8e86d9d3dfd68bebbfd1dd5006e0c25696855269 from master

[Tim Graham <timograham@…>]

In d3a8f36:

[1.8.x] Fixed #24780 -- Removed outdated discussion of signals and custom users.

Backport of 8e86d9d3dfd68bebbfd1dd5006e0c25696855269 from master