update comment

git-svn-id: http://libtorrent.googlecode.com/svn@10449 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
DHT node RTT fix

git-svn-id: http://libtorrent.googlecode.com/svn@10450 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
fix bug in DHT routing table node-id prefix optimization

git-svn-id: http://libtorrent.googlecode.com/svn@10451 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda