Fix mismatch between docs and backend/BUILD in master in examples/tutorial.
Fix mismatch between docs and backend/BUILD in master in examples/tutorial.

The tutorial is broken when using the original BUILD source copied from the docs, and this change fixes it.

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Reviewed-on: https://github.com/bazelbuild/bazel/pull/1137
MOS_MIGRATED_REVID=120102063

meteorcloudy/bazel,twitter-forks/bazel,whuwxl/bazel,variac/bazel,mbrukman/bazel,mbrukman/bazel,spxtr/bazel,anupcshan/bazel,LuminateWireless/bazel,juhalindfors/bazel-patches,hermione521/bazel,mbrukman/bazel,davidzchen/bazel,Asana/bazel,damienmg/bazel,abergmeier-dsfishlabs/bazel,dslomov/bazel,cushon/bazel,akira-baruah/bazel,kchodorow/bazel-1,akira-baruah/bazel,damienmg/bazel,werkt/bazel,whuwxl/bazel,aehlig/bazel,dslomov/bazel,aehlig/bazel,iamthearm/bazel,dslomov/bazel-windows,mikelalcon/bazel,mrdomino/bazel,LuminateWireless/bazel,Asana/bazel,mbrukman/bazel,ulfjack/bazel,ulfjack/bazel,kchodorow/bazel-1,UrbanCompass/bazel,werkt/bazel,iamthearm/bazel,davidzchen/bazel,abergmeier-dsfishlabs/bazel,Asana/bazel,juhalindfors/bazel-patches,damienmg/bazel,abergmeier-dsfishlabs/bazel,twitter-forks/bazel,iamthearm/bazel,cushon/bazel,safarmer/bazel,mikelikespie/bazel,ulfjack/bazel,kchodorow/bazel-1,mikelikespie/bazel,dslomov/bazel,LuminateWireless/bazel,juhalindfors/bazel-patches,dropbox/bazel,bazelbuild/bazel,aehlig/bazel,damienmg/bazel,anupcshan/bazel,kchodorow/bazel,katre/bazel,spxtr/bazel,snnn/bazel,safarmer/bazel,Asana/bazel,davidzchen/bazel,mikelikespie/bazel,kchodorow/bazel,katre/bazel,dslomov/bazel-windows,safarmer/bazel,mrdomino/bazel,kchodorow/bazel,Asana/bazel,anupcshan/bazel,mrdomino/bazel,juhalindfors/bazel-patches,davidzchen/bazel,meteorcloudy/bazel,juhalindfors/bazel-patches,dropbox/bazel,damienmg/bazel,mikelalcon/bazel,hermione521/bazel,dslomov/bazel-windows,UrbanCompass/bazel,perezd/bazel,mrdomino/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,UrbanCompass/bazel,werkt/bazel,kchodorow/bazel,snnn/bazel,dslomov/bazel,iamthearm/bazel,kchodorow/bazel-1,aehlig/bazel,mikelalcon/bazel,dslomov/bazel-windows,aehlig/bazel,abergmeier-dsfishlabs/bazel,iamthearm/bazel,dropbox/bazel,zhexuany/bazel,werkt/bazel,twitter-forks/bazel,ButterflyNetwork/bazel,meteorcloudy/bazel,snnn/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,kchodorow/bazel-1,Asana/bazel,anupcshan/bazel,perezd/bazel,ButterflyNetwork/bazel,ulfjack/bazel,cushon/bazel,katre/bazel,Asana/bazel,twitter-forks/bazel,spxtr/bazel,anupcshan/bazel,variac/bazel,kchodorow/bazel,juhalindfors/bazel-patches,cushon/bazel,meteorcloudy/bazel,akira-baruah/bazel,whuwxl/bazel,mikelikespie/bazel,aehlig/bazel,snnn/bazel,perezd/bazel,davidzchen/bazel,LuminateWireless/bazel,zhexuany/bazel,UrbanCompass/bazel,whuwxl/bazel,abergmeier-dsfishlabs/bazel,dropbox/bazel,katre/bazel,whuwxl/bazel,perezd/bazel,iamthearm/bazel,cushon/bazel,mbrukman/bazel,mikelalcon/bazel,damienmg/bazel,mikelalcon/bazel,twitter-forks/bazel,safarmer/bazel,akira-baruah/bazel,twitter-forks/bazel,mikelikespie/bazel,hermione521/bazel,mrdomino/bazel,anupcshan/bazel,aehlig/bazel,ulfjack/bazel,dslomov/bazel,safarmer/bazel,mikelalcon/bazel,variac/bazel,davidzchen/bazel,hermione521/bazel,perezd/bazel,perezd/bazel,variac/bazel,dslomov/bazel,dslomov/bazel-windows,hermione521/bazel,werkt/bazel,kchodorow/bazel,variac/bazel,zhexuany/bazel,bazelbuild/bazel,LuminateWireless/bazel,akira-baruah/bazel,UrbanCompass/bazel,davidzchen/bazel,whuwxl/bazel,safarmer/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,UrbanCompass/bazel,zhexuany/bazel,akira-baruah/bazel,hermione521/bazel,ulfjack/bazel,dslomov/bazel,mrdomino/bazel,snnn/bazel,zhexuany/bazel,werkt/bazel,mikelikespie/bazel,dropbox/bazel,snnn/bazel,bazelbuild/bazel,abergmeier-dsfishlabs/bazel,dropbox/bazel,spxtr/bazel,mbrukman/bazel,damienmg/bazel,zhexuany/bazel,katre/bazel,kchodorow/bazel,meteorcloudy/bazel,cushon/bazel,bazelbuild/bazel,LuminateWireless/bazel,spxtr/bazel,variac/bazel,snnn/bazel,katre/bazel,ulfjack/bazel,spxtr/bazel,dslomov/bazel-windows,juhalindfors/bazel-patches,variac/bazel,perezd/bazel,bazelbuild/bazel,spxtr/bazel,kchodorow/bazel-1