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Update understanding_qmk.md (#19664) 

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
} }
``` ```
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. 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.