Bring DurationHandleFractions in line with spec text
Bring DurationHandleFractions in line with spec text

(Except for the spec text typo of _mics_ for _mils_ which is to be
proposed as a normative change) this brings the code in line with the spec
text for DurationHandleFractions.

js-temporal/temporal-polyfill,js-temporal/temporal-polyfill,js-temporal/temporal-polyfill