Add TOC to Java tutorial.
Add TOC to Java tutorial.

RELNOTES: None.
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dslomov/bazel,twitter-forks/bazel,ulfjack/bazel,aehlig/bazel,safarmer/bazel,snnn/bazel,twitter-forks/bazel,bazelbuild/bazel,ButterflyNetwork/bazel,perezd/bazel,safarmer/bazel,ulfjack/bazel,cushon/bazel,akira-baruah/bazel,katre/bazel,meteorcloudy/bazel,werkt/bazel,dropbox/bazel,twitter-forks/bazel,bazelbuild/bazel,ButterflyNetwork/bazel,dslomov/bazel,twitter-forks/bazel,dropbox/bazel,dslomov/bazel,aehlig/bazel,spxtr/bazel,akira-baruah/bazel,katre/bazel,damienmg/bazel,damienmg/bazel,dslomov/bazel-windows,dropbox/bazel,dslomov/bazel-windows,bazelbuild/bazel,dropbox/bazel,damienmg/bazel,dropbox/bazel,davidzchen/bazel,cushon/bazel,dslomov/bazel,spxtr/bazel,safarmer/bazel,perezd/bazel,cushon/bazel,snnn/bazel,spxtr/bazel,katre/bazel,dslomov/bazel,spxtr/bazel,aehlig/bazel,meteorcloudy/bazel,twitter-forks/bazel,ulfjack/bazel,akira-baruah/bazel,aehlig/bazel,ButterflyNetwork/bazel,werkt/bazel,werkt/bazel,spxtr/bazel,ulfjack/bazel,bazelbuild/bazel,meteorcloudy/bazel,akira-baruah/bazel,dslomov/bazel-windows,davidzchen/bazel,katre/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,damienmg/bazel,bazelbuild/bazel,katre/bazel,davidzchen/bazel,perezd/bazel,twitter-forks/bazel,ButterflyNetwork/bazel,davidzchen/bazel,dslomov/bazel-windows,snnn/bazel,cushon/bazel,aehlig/bazel,damienmg/bazel,snnn/bazel,davidzchen/bazel,safarmer/bazel,bazelbuild/bazel,perezd/bazel,safarmer/bazel,ulfjack/bazel,safarmer/bazel,damienmg/bazel,perezd/bazel,ulfjack/bazel,davidzchen/bazel,dslomov/bazel,dslomov/bazel-windows,perezd/bazel,meteorcloudy/bazel,davidzchen/bazel,werkt/bazel,werkt/bazel,dslomov/bazel,dslomov/bazel-windows,akira-baruah/bazel,katre/bazel,meteorcloudy/bazel,perezd/bazel,ButterflyNetwork/bazel,spxtr/bazel,dropbox/bazel,snnn/bazel,aehlig/bazel,damienmg/bazel,snnn/bazel,aehlig/bazel,ulfjack/bazel,werkt/bazel,spxtr/bazel,snnn/bazel,meteorcloudy/bazel,cushon/bazel,meteorcloudy/bazel,akira-baruah/bazel,cushon/bazel