bpo-35119: Fix RecursionError in example of customizing module attribute access. (GH-10323)

https://bugs.python.org/issue35119
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 6067c72..24c647d 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1580,7 +1580,7 @@
 
        def __setattr__(self, attr, value):
            print(f'Setting {attr}...')
-           setattr(self, attr, value)
+           super().__setattr__(attr, value)
 
    sys.modules[__name__].__class__ = VerboseModule