Remove recommendation to use deprecated fetchSignInMethods #3571

Job	Run time
catalyst	4m 48s
integration-tests	16m 34s
quickstart	5m 5s
pod-lib-lint (FirebaseAuthInterop.podspec, ios, macos-12)	2m 21s
pod-lib-lint (FirebaseAuthInterop.podspec, ios, macos-13)	2m 55s
spm (iOS, macos-12)	7m 56s
pod-lib-lint (FirebaseAuthInterop.podspec, tvos, macos-12)	2m 10s
spm (iOS, macos-13)	4m 5s
pod-lib-lint (FirebaseAuthInterop.podspec, tvos, macos-13)	2m 25s
spm (tvOS, macos-12)	7m 5s
pod-lib-lint (FirebaseAuthInterop.podspec, macos --skip-tests, macos-12)	2m 31s
spm (tvOS, macos-13)	4m 5s
spm (macOS, macos-12)	3m 28s
pod-lib-lint (FirebaseAuthInterop.podspec, macos --skip-tests, macos-13)	3m 56s
spm (macOS, macos-13)	5m 31s
pod-lib-lint (FirebaseAuthInterop.podspec, watchos, macos-12)	1m 59s
spm (catalyst, macos-12)	3m 35s
pod-lib-lint (FirebaseAuthInterop.podspec, watchos, macos-13)	3m 54s
spm (catalyst, macos-13)	4m 46s
pod-lib-lint (FirebaseAuth.podspec, ios, macos-12)	11m 48s
spm (watchOS, macos-12)	4m 24s
spm (watchOS, macos-13)	4m 1s
pod-lib-lint (FirebaseAuth.podspec, ios, macos-13)	5m 4s
pod-lib-lint (FirebaseAuth.podspec, tvos, macos-12)	5m 30s
pod-lib-lint (FirebaseAuth.podspec, tvos, macos-13)	3m 42s
pod-lib-lint (FirebaseAuth.podspec, macos --skip-tests, macos-12)	3m 47s
pod-lib-lint (FirebaseAuth.podspec, macos --skip-tests, macos-13)	5m 1s
pod-lib-lint (FirebaseAuth.podspec, watchos, macos-12)	3m 21s
pod-lib-lint (FirebaseAuth.podspec, watchos, macos-13)	6m 12s
auth-cron-only	0s
	2h 21m 59s

Provide feedback