DOC remove MatplotlibDeprecationWarnings for `plot_concentration_prior.py` example (#24821)
DOC remove MatplotlibDeprecationWarnings for `plot_concentration_prior.py` example (#24821)


vinayak-mehta/scikit-learn,betatim/scikit-learn,scikit-learn/scikit-learn,betatim/scikit-learn,espg/scikit-learn,scikit-learn/scikit-learn,vinayak-mehta/scikit-learn,betatim/scikit-learn,betatim/scikit-learn,espg/scikit-learn,scikit-learn/scikit-learn,vinayak-mehta/scikit-learn,espg/scikit-learn,espg/scikit-learn,scikit-learn/scikit-learn,vinayak-mehta/scikit-learn