Update the documentation to describe the new mktemp() family behaviour. Also notes that mkstemp() first appeared in 4.4BSD (change obtained from OpenBSD)
Update the documentation to describe the new mktemp() family behaviour.
Also notes that mkstemp() first appeared in 4.4BSD (change obtained
from OpenBSD)

Reviewed by:	sheldonh

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