Mistake in auth provider callbacks documentation

[hannesharnisch]

The example of the password auth provider callbacks does not work because it returns a string instead of a Tuple[string,...]:

async def check_my_login(
        self,
        username: str,
        login_type: str,
        login_dict: "synapse.module_api.JsonDict",
    ) -> Optional[
        Tuple[
            str,
            Optional[Callable[["synapse.module_api.LoginResponse"], Awaitable[None]]],
        ]
    ]:
        if login_type != "my.login_type":
            return None

        if self.credentials.get(username) == login_dict.get("my_field"):
            return self.api.get_qualified_user_id(username)

Link: https://matrix-org.github.io/synapse/develop/modules/password_auth_provider_callbacks.html

If you try to use it it throws an error, that the returned type is not of type Tuple[string,...]

It works if you use:

return (self.api.get_qualified_user_id(username),None)