🚨(linter) add missing docstrings

Title says all there is to say…

src/backend/core/resource_server/__init__.py

@@ -0,0 +1 @@
+"""Backend resource server module."""

src/backend/core/resource_server/authentication.py

@@ -19,6 +19,7 @@ class ResourceServerAuthentication(OIDCAuthentication):
     """Authenticate clients using the token received from the authorization server."""
 
     def __init__(self):
+        """Require authentication to be configured in order to instantiate."""
         super().__init__()
 
         try:
@@ -40,7 +41,7 @@ class ResourceServerAuthentication(OIDCAuthentication):
     def get_access_token(self, request):
         """Retrieve and decode the access token from the request.
 
-        This method overcharges the 'get_access_token' method from the parent class,
+        This method overrides the 'get_access_token' method from the parent class,
         to support service providers that would base64 encode the bearer token.
         """
 

src/backend/core/resource_server/backend.py

@@ -33,6 +33,7 @@ class ResourceServerBackend:
 
     # pylint: disable=too-many-instance-attributes
     def __init__(self, authorization_server_client):
+        """Require client_id, client_secret set and authorization_server_client provided."""
         # pylint: disable=invalid-name
         self.UserModel = auth.get_user_model()
 

src/backend/core/resource_server/clients.py

@@ -31,6 +31,8 @@ class AuthorizationServerClient:
         timeout,
         proxy,
     ):
+        """Require at a minimum url, url_jwks and url_introspection."""
+
         if not url or not url_jwks or not url_introspection:
             raise ImproperlyConfigured(
                 "Could not instantiate AuthorizationServerClient, some parameters are missing."