documentation fix (and regenerated html)

git-svn-id: http://libtorrent.googlecode.com/svn@10581 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
add missing document

git-svn-id: http://libtorrent.googlecode.com/svn@10582 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda