Add a note on what happens if the "-p" option is specified and a final directory already exists.
Add a note on what happens if the "-p" option is specified
and a final directory already exists.

Reviewed by:	freebsd-audit
MFC after:	5 days

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