Fix the extra "of" in the help text.
Fix the extra "of" in the help text.

pfsense/pfsense,ptorsten/pfsense,phil-davis/pfsense,pfsense/pfsense,pfsense/pfsense,NewEraCracker/pfsense,NOYB/pfsense,NewEraCracker/pfsense,dennypage/pfsense,pfsense/pfsense,dennypage/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,phil-davis/pfsense,dennypage/pfsense,NOYB/pfsense,dennypage/pfsense,phil-davis/pfsense,NOYB/pfsense