Fix error in C++ use cases documentation
Fix error in C++ use cases documentation

In the sample scenario, the legacy library includes `include/some_lib.h`, so `copts` should not add the final `include` directory to the include path.

Closes #9704.

PiperOrigin-RevId: 275218618

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