Replace the inappropriate use of .Nx (netBSD) with a more generalized .Ux (UNIX) as is appropriate in the context used.
Replace the inappropriate use of .Nx (netBSD) with a more generalized
.Ux (UNIX) as is appropriate in the context used.

PR:		17954
Submitted by:	Brian Handy <handy@physics.montana.edu>

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