DOC improve the random forest feature importance comparison example (#23085)
DOC improve the random forest feature importance comparison example (#23085)

Co-authored-by: Thomas J. Fan <5e8796a332fafc9c261437cd1787ae2709a896a7@gmail.com>
Co-authored-by: Christian Lorentzen <9418c66efc1fe36fdae4d3b96d40e9819e993828@gmail.com>
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