[SPARK-3723] [MLlib] Adding instrumentation to random forests #13881
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What changes were proposed in this pull request?
In RandomForest.run(), added instrumentation for the number of node groups, along with the min, max, and average number of nodes per group.
Also fixed a typo in BaggedPoint.scala documentation.
How was this patch tested?
Tested by running RandomForestClassifierSuite, checking the test output manually to make sure instrumentation information was present and reasonable.