Adding required period

server/corvus/api/user_api.py

@@ -123,7 +123,7 @@ def delete_user(name: str) -> APIResponse:
     required_auth=Auth.TOKEN, required_role=Role.USER)
 def get_roles() -> APIResponse:
     """
-    List the roles available on the service
+    List the roles available on the service.
 
     :return: The list of roles
     """