Clarify doc related to declare_file and declared outputs.
Clarify doc related to declare_file and declared outputs.

RELNOTES: None.
PiperOrigin-RevId: 185372459

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