Update iOS tutorial to reference latest release
Update iOS tutorial to reference latest release

Closes #4712.

PiperOrigin-RevId: 187486082

perezd/bazel,cushon/bazel,perezd/bazel,werkt/bazel,ulfjack/bazel,perezd/bazel,dropbox/bazel,safarmer/bazel,dropbox/bazel,perezd/bazel,dropbox/bazel,meteorcloudy/bazel,katre/bazel,katre/bazel,dslomov/bazel-windows,cushon/bazel,meteorcloudy/bazel,cushon/bazel,meteorcloudy/bazel,ulfjack/bazel,dslomov/bazel,ButterflyNetwork/bazel,akira-baruah/bazel,davidzchen/bazel,ButterflyNetwork/bazel,ulfjack/bazel,meteorcloudy/bazel,bazelbuild/bazel,katre/bazel,cushon/bazel,bazelbuild/bazel,katre/bazel,dslomov/bazel,akira-baruah/bazel,davidzchen/bazel,perezd/bazel,davidzchen/bazel,werkt/bazel,dslomov/bazel,ulfjack/bazel,ButterflyNetwork/bazel,katre/bazel,werkt/bazel,dropbox/bazel,safarmer/bazel,davidzchen/bazel,akira-baruah/bazel,dslomov/bazel-windows,ButterflyNetwork/bazel,aehlig/bazel,ButterflyNetwork/bazel,davidzchen/bazel,twitter-forks/bazel,meteorcloudy/bazel,dslomov/bazel-windows,meteorcloudy/bazel,cushon/bazel,dslomov/bazel,werkt/bazel,dslomov/bazel-windows,safarmer/bazel,twitter-forks/bazel,dropbox/bazel,safarmer/bazel,dropbox/bazel,twitter-forks/bazel,twitter-forks/bazel,safarmer/bazel,werkt/bazel,bazelbuild/bazel,akira-baruah/bazel,dslomov/bazel,akira-baruah/bazel,twitter-forks/bazel,safarmer/bazel,ulfjack/bazel,meteorcloudy/bazel,perezd/bazel,perezd/bazel,twitter-forks/bazel,werkt/bazel,aehlig/bazel,ulfjack/bazel,dslomov/bazel,dslomov/bazel-windows,katre/bazel,aehlig/bazel,aehlig/bazel,twitter-forks/bazel,bazelbuild/bazel,davidzchen/bazel,aehlig/bazel,dslomov/bazel-windows,aehlig/bazel,ulfjack/bazel,akira-baruah/bazel,ButterflyNetwork/bazel,dslomov/bazel,bazelbuild/bazel,aehlig/bazel,cushon/bazel,davidzchen/bazel,bazelbuild/bazel