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Update understanding_qmk.md (#19664)

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Changed "...4 row by 5 column numpad" to "...5 row by 4 column numpad" on line 46.
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@ -43,7 +43,7 @@ While there are different strategies for doing the actual matrix detection, they
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That datastructure is a direct representation of the matrix for a 4 row by 5 column numpad. When a key is pressed that key's position within the matrix will be returned as `1` instead of `0`.
That datastructure is a direct representation of the matrix for a 5 row by 4 column numpad. When a key is pressed that key's position within the matrix will be returned as `1` instead of `0`.
Matrix Scanning runs many times per second. The exact rate varies but typically it runs at least 10 times per second to avoid perceptible lag.