Fix incorrect refillPeriodMicros unit in the document

[frezcirno]

The default value for refillPeriodMicros is 100 * 1000, which means 100ms (or 100,000us).

The document comments say 100,000ms (equivalent to 100 seconds), which is incorrect and misleading. This PR fixes this typo.

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[ajkr]

LGTM, thanks!

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@ajkr has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@ajkr merged this pull request in a97a1f3.