Fixed N and D comment for KMeans example #3584
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The machine_learning/kmeans.cpp example has a comment which says n is the number of features and d is the feature size (the code is correct, but the comment explaining it mixes up the values).
It may not seem like a big deal, but I found this example when working on my own project with different dimensions, and it caused me a headache debugging why my dimensions were wrong when using your example since I had flipped N and D.
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