Update eventcounter spec (#23019)
Update eventcounter spec (#23019)

* Update EventCounter spec

* some wording fix

* some wording fix

* fix payload example

* Add DisplayRateTimeScale

krk/coreclr,cshung/coreclr,krk/coreclr,wtgodbe/coreclr,mmitche/coreclr,cshung/coreclr,krk/coreclr,wtgodbe/coreclr,cshung/coreclr,poizan42/coreclr,wtgodbe/coreclr,mmitche/coreclr,poizan42/coreclr,cshung/coreclr,wtgodbe/coreclr,mmitche/coreclr,poizan42/coreclr,krk/coreclr,krk/coreclr,krk/coreclr,poizan42/coreclr,mmitche/coreclr,poizan42/coreclr,mmitche/coreclr,wtgodbe/coreclr,cshung/coreclr,mmitche/coreclr,cshung/coreclr,wtgodbe/coreclr,poizan42/coreclr