updated the docstring in accordance with GH40378

Author: GivyBoy

pandas/core/frame.py

@@ -8333,12 +8333,16 @@ def update(
 2  Parrot       24.0
 3  Parrot       26.0
 
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 When using ``.groupby()`` on a multiple index dataframe,
 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"])