Correct the millimeter unit conversion constant in docs #3872
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I ran into this today where the conversion constant in the docs was wrong, but only slightly so, and it took a second to track down what was going on.
The inch's definition is derived from the definition of the yard and is exactly equivalent to 25.4 millimeters as of July 1st, 1959.
See: https://www.nist.gov/pml/owm/si-units-length
See: https://www.nist.gov/system/files/documents/2017/05/09/frn-59-5442-1959.pdf
Fixes closed issue #2608