Clarifying comment on overflow (#17865)
Clarifying comment on overflow (#17865)

* Clarifying comment on overflow

* Nits

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