update SafeHaven-Checkpoints with linux info
update SafeHaven-Checkpoints with linux info

added linux checkpoints showing as unknown info
ryanbrockman/PublicKB,StephanieWong/PublicKB,BryGittyUp/PublicKB,jwebs1/PublicKB,DLM1/PublicKB,ack/PublicKB,daveshac/PublicKB,adamd/PublicKB,eschubert/PublicKB,anthonyvetter/PublicKB,jtowns3/PublicKB,justinwithington/PublicKB,mark-turpin/PublicKB,duvander/PublicKB,mfar78/PublicKB,robcaldwell/PublicKB,jwcolbert/PublicKB,robertlesieur/PublicKB