Add note about the auto channel setting.
Add note about the auto channel setting.

brunostein/pfsense,phil-davis/pfsense,NOYB/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,BlackstarGroup/pfsense,dennypage/pfsense,pfsense/pfsense,ch1c4um/pfsense,ptorsten/pfsense,dennypage/pfsense,jxmx/pfsense,ch1c4um/pfsense,pfsense/pfsense,brunostein/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,brunostein/pfsense,ch1c4um/pfsense,BlackstarGroup/pfsense,BlackstarGroup/pfsense,NOYB/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,dennypage/pfsense,pfsense/pfsense,dennypage/pfsense,phil-davis/pfsense,pfsense/pfsense,NOYB/pfsense,jxmx/pfsense,ch1c4um/pfsense,BlackstarGroup/pfsense,jxmx/pfsense,phil-davis/pfsense