Clarification on interactions between hourCycle and dayPeriod (#28109)

updated Intl.DateTimeFormat constructor to clarify that hourCycle: `h11` option will allow dayPeriod to be shown

Previous wording implied that dayPeriod is only used if `(hourCycle: 'h12')` option is set, updated to reflect that `dayPeriod` is displayed if either `{hourCycle: 'h12'` or `(hourCycle: 'h11')` are set. See below:

```const date = new Date(Date.UTC(2020, 11, 20, 18, 23, 16, 738));
// Results below assume UTC timezone - your results may vary

console.log(new Intl.DateTimeFormat('en-US', {hourCycle: 'h11', hour: '2-digit', dayPeriod: 'long'}).format(date))
console.log(new Intl.DateTimeFormat('en-US', {hourCycle: 'h12', hour: '2-digit', dayPeriod: 'long'}).format(date))
console.log(new Intl.DateTimeFormat('en-US', {hourCycle: 'h23', hour: '2-digit', dayPeriod: 'long'}).format(date))
console.log(new Intl.DateTimeFormat('en-US', {hourCycle: 'h24', hour: '2-digit', dayPeriod: 'long'}).format(date))

// output: 
// > "10 in the morning" 
// > "10 in the morning"
// > "10" 
// > "10"```

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

@@ -106,7 +106,7 @@ Intl.DateTimeFormat(locales, options)
 
         > **Note:**
         >
-        > - This option only has an effect if a 12-hour clock is used.
+        > - This option only has an effect if a 12-hour clock (`hourCycle: 'h12'` or `hourCycle: 'h11'`) is used.
         > - Many locales use the same string irrespective of the width specified.
 
     - `numberingSystem`
@@ -316,7 +316,7 @@ console.log(mediumTime.format(Date.now())); // "07/07/20, 1:31:55 PM"
 
 ### Using dayPeriod
 
-Use the `dayPeriod` option to output a string for the times of day ("in the morning", "at night", "noon", etc.). Note, that this only works when formatting for a 12 hour clock (`hourCycle: 'h12'`) and that for many locales the strings are the same irrespective of the value passed for the `dayPeriod`.
+Use the `dayPeriod` option to output a string for the times of day ("in the morning", "at night", "noon", etc.). Note, that this only works when formatting for a 12 hour clock (`hourCycle: 'h12'` or `hourCycle: 'h11'`) and that for many locales the strings are the same irrespective of the value passed for the `dayPeriod`.
 
 ```js
 const date = Date.UTC(2012, 11, 17, 4, 0, 42);