Release notes for FIAM in M48 (#3016)
Release notes for FIAM in M48 (#3016)

* Release notes for FIAM in M48

* Add issue numbers for changelog

firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk