MFC r199244:   Fix the grammar in the isgraph(3) description, almost as per the PR.
MFC r199244:
  Fix the grammar in the isgraph(3) description, almost as per the PR.

  PR:           140455
  Submitted by: Jeremy Huddleston <jeremyhu@apple.com>

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase