Add a note that the -u option can be overridden by settings in login.conf(5).
Add a note that the -u option can be overridden by settings in login.conf(5).

PR:		docs/56017
Submitted by:	Josef El-Rayes <j.el-rayes@daemon.li>

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