updated the docstring in accordance with GH40378

Author: GivyBoy

pandas/core/frame.py

@@ -8337,14 +8337,6 @@ def update(
 do not specify both ``by`` and ``level``.
 The argument validation should be done in instead be done in
 ``.groupby()``, using the name of the specific index.
-
->>> df = pandas.DataFrame({"col1": ["a", "b", "c"]})
-
->>> df.index = pandas.MultiIndex.from_arrays([["a", "a", "b"],
-...                                           [1, 2, 1]],
-...                                           names=["x", "y"])
->>> df.groupby(["col1", "x"]) # Fine
->>> df.groupby("col1", level=0)  # TypeError
 """
     )
     @Appender(_shared_docs["groupby"] % _shared_doc_kwargs)