DOC Remove _"mse"_ from `RandomForestRegression` docstring (#21306)
DOC Remove _"mse"_ from `RandomForestRegression` docstring (#21306)

The _"mae"_ criterion was removed from the docstring in 36915ae390fab4742f98c82dc6802f072c4effa5. For consistency I think that _"mse"_ should be removed as well since both were deprecated in 1.0.
TomDLT/scikit-learn,vinayak-mehta/scikit-learn,jakirkham/scikit-learn,manhhomienbienthuy/scikit-learn,AlexandreAbraham/scikit-learn,sergeyf/scikit-learn,vinayak-mehta/scikit-learn,ivannz/scikit-learn,saiwing-yeung/scikit-learn,manhhomienbienthuy/scikit-learn,betatim/scikit-learn,betatim/scikit-learn,sergeyf/scikit-learn,ivannz/scikit-learn,scikit-learn/scikit-learn,scikit-learn/scikit-learn,espg/scikit-learn,betatim/scikit-learn,lesteve/scikit-learn,lesteve/scikit-learn,manhhomienbienthuy/scikit-learn,anntzer/scikit-learn,sergeyf/scikit-learn,AlexandreAbraham/scikit-learn,vinayak-mehta/scikit-learn,TomDLT/scikit-learn,scikit-learn/scikit-learn,AlexandreAbraham/scikit-learn,anntzer/scikit-learn,manhhomienbienthuy/scikit-learn,saiwing-yeung/scikit-learn,ivannz/scikit-learn,sergeyf/scikit-learn,ivannz/scikit-learn,saiwing-yeung/scikit-learn,jakirkham/scikit-learn,espg/scikit-learn,anntzer/scikit-learn,TomDLT/scikit-learn,jakirkham/scikit-learn,lesteve/scikit-learn,vinayak-mehta/scikit-learn,jakirkham/scikit-learn,TomDLT/scikit-learn,espg/scikit-learn,anntzer/scikit-learn,scikit-learn/scikit-learn,betatim/scikit-learn,saiwing-yeung/scikit-learn,AlexandreAbraham/scikit-learn,espg/scikit-learn,lesteve/scikit-learn