Fix AXES_CLIENT_IP_CALLABLE error

Previously, the readme suggested the AXES_CLIENT_IP_CALLABLE function should have two arguments, but actually it only takes one argument.

docs/4_configuration.rst

@@ -55,7 +55,7 @@ The following ``settings.py`` options are available for customizing Axes behavio
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 | AXES_LOCKOUT_CALLABLE                                | None                                         | A callable or a string path to callable that takes two arguments returns a response. For example: ``def generate_lockout_response(request: HttpRequest, credentials: dict) -> HttpResponse: ...``. This can be any callable similarly to ``AXES_USERNAME_CALLABLE``. If not callable is defined, then the default implementation in ``axes.helpers.get_lockout_response`` is used for determining the correct lockout response that is sent to the requesting client.                                                                                                                                                                                                                                                                     |
 +------------------------------------------------------+----------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| AXES_CLIENT_IP_CALLABLE                              | None                                         | A callable or a string path to callable that takes two arguments returns a response. For example: ``def get_ip(request: HttpRequest) -> str: ...``. This can be any callable similarly to ``AXES_USERNAME_CALLABLE``. If not callable is defined, then the default implementation in ``axes.helpers.get_client_ip_address`` is used.                                                                                                                                                                                                                                                                                                                                                                                                      |
+| AXES_CLIENT_IP_CALLABLE                              | None                                         | A callable or a string path to callable that takes HttpRequest as an argument and returns the resolved IP as a response. For example: ``def get_ip(request: HttpRequest) -> str: ...``. This can be any callable similarly to ``AXES_USERNAME_CALLABLE``. If not callable is defined, then the default implementation in ``axes.helpers.get_client_ip_address`` is used.                                                                                                                                                                                                                                                                                                                                                                                                      |
 +------------------------------------------------------+----------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | AXES_PASSWORD_FORM_FIELD                             | 'password'                                   | The name of the form or credentials field that contains your users password.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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