Update international-currency-support.md
Update international-currency-support.md

slight adjustement to language highlighting non-USD currency customers must be corporate invoiced customers.
adamd/PublicKB,duvander/PublicKB,daveshac/PublicKB,robcaldwell/PublicKB,StephanieWong/PublicKB,BryGittyUp/PublicKB,robertlesieur/PublicKB,justinwithington/PublicKB,keithresar/clc_public_kb,ack/PublicKB,jmalmadclc/PublicKB,jwebs1/PublicKB,ryanbrockman/PublicKB,leporaj/PublicKB,DLM1/PublicKB,anthonyvetter/PublicKB,mfar78/PublicKB,eschubert/PublicKB,jwcolbert/PublicKB,mark-turpin/PublicKB,appfog/PublicKB,jtowns3/PublicKB