bpo-35614: Fix pydoc help() on metaclasses (#11357)

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 1d84b84..59f6e39 100644
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -1255,7 +1255,7 @@
 
         # List the built-in subclasses, if any:
         subclasses = sorted(
-            (str(cls.__name__) for cls in object.__subclasses__()
+            (str(cls.__name__) for cls in type.__subclasses__(object)
              if not cls.__name__.startswith("_") and cls.__module__ == "builtins"),
             key=str.lower
         )