Improve sizeof example code #538
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This improves the example code that demonstrates how to use sizeof to determine the number of elements in an array of any type. - In the description, specify that we're talking about arrays, just to be absolutely clear. - Define the array in the example code. - Add an explanatory comment to the for loop
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This improves the example code that demonstrates how to use sizeof to determine the number of elements in an array of any type.
Originally proposed at arduino/reference-pt#222 (comment)