Fix doc of `windowed_mean|variance` to match implementation#1599

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nicolaspi wants to merge 2 commits intotensorflow:mainfrom

nicolaspi:doc-fix

Commits on Aug 5, 2022

Fix doc of `windowed_variance` to match implementation
nicolaspi
authored

Commits on Aug 7, 2022

Fix doc of `windowed_mean` to match implementation
nicolaspi
authored