Update billing-process-overview.md
Update billing-process-overview.md

Fix url
BryGittyUp/PublicKB,robertlesieur/PublicKB,maxim-clc/PublicKB,anthonyvetter/PublicKB,csterwa/PublicKB,adamd/PublicKB,mclose/PublicKB,jruckle/PublicKB,appfog/PublicKB,DLM1/PublicKB,ryanbrockman/PublicKB,ian-plosker/PublicKB,duvander/PublicKB,mfar78/PublicKB,broneal/PublicKB,bburge/PublicKB,BobStolzberg/PublicKB,StephanieWong/PublicKB,jtowns3/PublicKB,thenley/PublicKB,eschubert/PublicKB,jwebs1/PublicKB,jwcolbert/PublicKB,SeanRobb/PublicKB,lmcornejo/PublicKB,jmalmadclc/PublicKB,keithresar/clc_public_kb,daveshac/PublicKB,leporaj/PublicKB,ack/PublicKB,robcaldwell/PublicKB,mark-turpin/PublicKB,justinwithington/PublicKB