Clarify that devfs_system_ruleset should contain a name, not a number. Prompted by PR conf/85363
Clarify that devfs_system_ruleset should contain a name, not a number.
Prompted by PR conf/85363

MFC after: 3 days

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