Document the markers used for local service discovery.
Document the markers used for local service discovery.

refs #100134

svartika/ccnx,svartika/ccnx,ebollens/ccnmp,cawka/ndnx,cawka/ndnx,svartika/ccnx,svartika/ccnx,ebollens/ccnmp,svartika/ccnx,cawka/ndnx,ebollens/ccnmp,ebollens/ccnmp,cawka/ndnx,cawka/ndnx,svartika/ccnx,svartika/ccnx