Remove bogus reference to mkfilters(1)
Remove bogus reference to mkfilters(1)

PR:		docs/7790
Submitted by:	Stefan Eggers seggers@semyam.dinoco.de

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