Clarify on the return object type of TRIGGER.GET_METADATA_AUTO_CONF_URLS and add an example (#355)

Author: noppanut15

AUTHORS.md

@@ -61,3 +61,4 @@ an issue.
 - [Michael V. Battista](https://github.com/mvbattista)
 - [William Abbott](https://github.com/wrabit)
 - [Henry Harutyunyan](https://github.com/henryh9n) (Revolut)
+- [Noppanut Ploywong](https://github.com/noppanut15)

README.md

@@ -256,7 +256,7 @@ Some of the following settings are related to how this module operates. The rest
 | **TRIGGER.CREATE\_USER**                    | A method to be called upon new user creation. This method will be called before the new user is logged in and after the user's record is created. This method should accept ONE parameter of user dict.                                                                                                                                                                                                                                                     | `str`            | `None`                                                                                                                                   | `my_app.models.users.create`                                                            |
 | **TRIGGER.BEFORE\_LOGIN**                   | A method to be called when an existing user logs in. This method will be called before the user is logged in and after the SAML2 identity provider returns user attributes. This method should accept ONE parameter of user dict.                                                                                                                                                                                                                           | `str`            | `None`                                                                                                                                   | `my_app.models.users.before_login`                                                      |
 | **TRIGGER.AFTER\_LOGIN**                    | A method to be called when an existing user logs in. This method will be called after the user is logged in and after the SAML2 identity provider returns user attributes. This method should accept TWO parameters of session and user dict.                                                                                                                                                                                                               | `str`            | `None`                                                                                                                                   | `my_app.models.users.after_login`                                                       |
-| **TRIGGER.GET\_METADATA\_AUTO\_CONF\_URLS** | A hook function that returns a list of metadata Autoconf URLs. This can override the `METADATA_AUTO_CONF_URL` to enumerate all existing metadata autoconf URLs.                                                                                                                                                                                                                                                                                             | `str`            | `None`                                                                                                                                   | `my_app.models.users.get_metadata_autoconf_urls`                                        |
+| **TRIGGER.GET\_METADATA\_AUTO\_CONF\_URLS** | A hook function that returns a list of metadata Autoconf URLs as dictionary, where the key is `"url"` and the value is the corresponding metadata Autoconf URL. (e.g., `[{"url": METADATA_URL1}, {"url": METADATA_URL2}]`). This can override the `METADATA_AUTO_CONF_URL` to enumerate all existing metadata autoconf URLs.                                                                                                                                | `str`            | `None`                                                                                                                                   | `my_app.models.users.get_metadata_autoconf_urls`                                        |
 | **TRIGGER.GET\_CUSTOM\_METADATA**           | A hook function to retrieve the SAML2 metadata with a custom method. This method should return a SAML metadata object as dictionary (`Mapping[str, Any]`). If added, it overrides all other configuration to retrieve metadata. An example can be found in `tests.test_saml.get_custom_metadata_example`. This method accepts the same three parameters of the django_saml2_auth.saml.get_metadata function: `user_id`, `domain`, `saml_response`.          | `str`            | `None`, `None`, `None`                                                                                                                   | `my_app.utils.get_custom_saml_metadata`                                                 |
 | **TRIGGER.CUSTOM\_DECODE\_JWT**             | A hook function to decode the user JWT. This method will be called instead of the `decode_jwt_token` default function and should return the user_model.USERNAME_FIELD. This method accepts one parameter: `token`.                                                                                                                                                                                                                                          | `str`            | `None`                                                                                                                                   | `my_app.models.users.decode_custom_token`                                               |
 | **TRIGGER.CUSTOM\_CREATE\_JWT**             | A hook function to create a custom JWT for the user. This method will be called instead of the `create_jwt_token` default function and should return the token. This method accepts one parameter: `user`.                                                                                                                                                                                                                                                  | `str`            | `None`                                                                                                                                   | `my_app.models.users.create_custom_token`                                               |