-fix typos

git-svn-id: https://gnunet.org/svn/gnunet@32138 140774ce-b5e7-0310-ab8b-a85725594a96
importing man pages written by Bertrand Marc for Debian

git-svn-id: https://gnunet.org/svn/gnunet@32139 140774ce-b5e7-0310-ab8b-a85725594a96