fix indentation in docs

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@9792 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
curve25519 -> ed25519

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@9793 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda