Replace `.Os BSD' which caused a troff error with `.Bx' which also happens to be the correct macro to use in this situation.
Replace `.Os BSD' which caused a troff error with `.Bx' which also
happens to be the correct macro to use in this situation.

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