updated the docstring in accordance with GH40378

GivyBoy · GivyBoy · commit 1b39a256346c · 2022-07-12T18:38:08.000-04:00
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
@@ -8333,9 +8333,6 @@ 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
