docs: fix ios-app tutorial
docs: fix ios-app tutorial

The patch allows `bazel build //ios-app:ios-app` work well following "Create a BUILD file" instructions in [Introduction to Bazel: Building an iOS App](https://docs.bazel.build/versions/master/tutorial/ios-app.html).

Closes #10271.

PiperOrigin-RevId: 284079718

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