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prop#324: mention rearranged form for N_EWMA smoothing

eta requested to merge eta/torspec:eta/n-ewma-smoothing-formula into main

The formula used for N_EWMA is actually rearranged in the C tor implementation, in a way that caused the arti reimplementation to be off by a small rounding error until it was corrected.

In order to ensure other implementations don't have this issue, mention the rearranged form and add a requirement that it be used.

(background: arti!525 (comment 2807244))

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