Update Intl.DateTimeFormat to reflect new behaviour of hourCycle

option after tc39/ecma402#758

files/en-us/web/javascript/reference/global_objects/intl/datetimeformat/datetimeformat/index.md

@@ -55,7 +55,8 @@ Intl.DateTimeFormat(locales, options)
 - `numberingSystem`
   - : The numbering system to use for number formatting, such as `"arab"`, `"hans"`, `"mathsans"`, and so on. For a list of supported numbering system types, see [`Intl.Locale.prototype.getNumberingSystems()`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getNumberingSystems#supported_numbering_system_types). This option can also be set through the `nu` Unicode extension key; if both are provided, this `options` property takes precedence.
 - `hour12`
-  - : Whether to use 12-hour time (as opposed to 24-hour time). Possible values are `true` and `false`; the default is locale dependent. This option overrides the `hc` locale extension tag and/or the `hourCycle` option in case both are present. It sets `hourCycle` to `"h11"` or `"h12"` when `true`, and `"h23"` or `"h24"` when `false`, the exact choice depending on the locale — for example, if the locale most prefers `"h23"` but `hour12` is `true`, then the final hour cycle is `"h11"`.
+  - : Whether to use 12-hour time (as opposed to 24-hour time). Possible values are `true` and `false`; the default is locale dependent. When `true`, it sets `hourCycle` to either `"h11"` or `"h12"`, depending on the locale. When `false`, it sets `hourCycle` to `"h23"`. This option overrides the `hc` locale extension tag and/or the `hourCycle` option in case both are present.
+
 - `hourCycle`
   - : The hour cycle to use. Possible values are `"h11"`, `"h12"`, `"h23"`, and `"h24"`. This option can also be set through the `hc` Unicode extension key; if both are provided, this `options` property takes precedence.
 - `timeZone`