Remove obsolete comment from core/README
Remove obsolete comment from core/README

root-mirror/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,karies/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,karies/root,karies/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,karies/root,karies/root,olifre/root,olifre/root