[DOC] Tag "multioutput" is stated 'unused' but it is used in code #16357
Description
In the documentation
https://scikit-learn.org/dev/developers/develop.html?highlight=tags
it mentions
multioutput - unused for now (default=``False``)
My suggestion is to remove the - unused for now part, because it is actually being used in
or
scikit-learn/sklearn/utils/estimator_checks.py
Line 2037 in 42e17b3
(This is not an exhaustive search for places where the tag is in use).