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

davidzchen/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website