Update docs for get_composite_realm_roles_of_user

[ttante]

Hey all - I tried to make a PR myself but access was denied.

In the Keycloak admin panel under User > User Details, there is a toggle to view/hide 'Inherted' roles (roles inherited from composite roles - in this case roles that come from a group mapping to multiple roles).

The method get_realm_roles_of_user() does not return these, and it took me a long time to figure out that I needed to use get_composite_realm_roles_of_user() to access these roles.

It would be really helpful if the (documentation description for get_composite_realm_roles_of_user)[https://python-keycloak.readthedocs.io/en/latest/reference/keycloak/index.html#keycloak.KeycloakAdmin.get_composite_realm_roles_of_user] specified that the endpoint also includes roles Inherited from composites. If this were the case I would have saved hours.

I've been working with Keycloak for about 8 months now and it is a steep learning curve, but I would like to help alleviate the challenges for others as much as I can.

The description currently reads:
"Get all composite (i.e. implicit) realm roles for a user."
I think something like this should be appended: "Includes roles inherited from composites."

Thanks everyone.