Clarify notes for pptp "Server address"
Clarify notes for pptp "Server address"

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