added a section for PEERSTORE in tutorial


git-svn-id: https://gnunet.org/svn/gnunet@34071 140774ce-b5e7-0310-ab8b-a85725594a96
fix


git-svn-id: https://gnunet.org/svn/gnunet@34072 140774ce-b5e7-0310-ab8b-a85725594a96