Does #28827 also apply to applymap?
In  #28854, the note 

> In the current implementation applymap calls func twice on the first column/row to decide whether it can take a fast or slow code path. This can lead to unexpected behavior if func has side-effects, as they will take effect twice for the first column/row.

was removed from the `DataFrame.apply` docstring.

However, it is still in the [docstring](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.applymap.html?highlight=applymap#pandas.DataFrame.applymap) of `DataFrame.applymap`.

Does it need to be removed there too?

EDIT
----

As far as I can tell, this behaviour (calling the function twice to decide which path to take) still happens for `groupby.apply` and is what a user was asking about in #31111. Does it need to be documented in Groupby.Apply? Do end-users need to know about such internals?