fix docs linting error

gso/auth/oidc_policy_helper.py

@@ -94,7 +94,7 @@ class OIDCUserModel(dict):
 
     @property
     def client_id(self) -> str:
-        """Return the client_id."""
+        """Return the client id."""
         return self.get("client_id") or ""
 
     @property