MFC: r199255, r199257
MFC: r199255, r199257

Improved the manpage description.  The committed wording
was provided by jhb.

Remove a note about vfork(4) going to be eliminated, it's here to stay.

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