Move extra action flag docs into the Semantics section.
Move extra action flag docs into the Semantics section.

Previously, they were in the Error checking options section, which doesn't seem correct.

Change-Id: I1306da91cff01157963d56db267188bda7d57d4f
PiperOrigin-RevId: 177835450

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