Update Pkgpanda docs on well-known dirs
Update Pkgpanda docs on well-known dirs

kensipe/dcos,mesosphere-mergebot/mergebot-test-dcos,mesosphere-mergebot/dcos,surdy/dcos,mesosphere-mergebot/dcos,mesosphere-mergebot/mergebot-test-dcos,mellenburg/dcos,kensipe/dcos,amitaekbote/dcos,dcos/dcos,amitaekbote/dcos,amitaekbote/dcos,dcos/dcos,amitaekbote/dcos,mellenburg/dcos,surdy/dcos,surdy/dcos,dcos/dcos,dcos/dcos,GoelDeepak/dcos,mesosphere-mergebot/dcos,dcos/dcos,GoelDeepak/dcos,kensipe/dcos,mellenburg/dcos,surdy/dcos,GoelDeepak/dcos,GoelDeepak/dcos,mesosphere-mergebot/dcos,mesosphere-mergebot/mergebot-test-dcos,mellenburg/dcos,kensipe/dcos,mesosphere-mergebot/mergebot-test-dcos