improve docstring error handling

docs/sphinx/_ext/dagster-sphinx/dagster_sphinx/__init__.py

@@ -75,7 +75,7 @@ def record_error(env: BuildEnvironment, message: str) -> None:
 def check_public_method_has_docstring(env: BuildEnvironment, name: str, obj: object) -> None:
     if name != "__init__" and not obj.__doc__:
         message = (
-            f"Docstring not found for {obj}.{name}. "
+            f"Docstring not found for {obj.__repr__()}.{name}. "
             "All public methods and properties must have docstrings."
         )
         record_error(env, message)