docs(firestore): add an example to the detailed comment in compareUtf8Strings()#9154

dconeybe merged 2 commits intomainfirebase/firebase-js-sdk:mainfrom

dconeybe/firestore/Utf8StringCompareCommentExamplefirebase/firebase-js-sdk:dconeybe/firestore/Utf8StringCompareCommentExampleCopy head branch name to clipboard