fix mongodb test instructions
fix mongodb test instructions

annacarol/GeoGig,boundlessgeo/GeoGig,annacarol/GeoGig,annacarol/GeoGig,markles/GeoGit,markles/GeoGit,markles/GeoGit,markles/GeoGit,boundlessgeo/GeoGig,boundlessgeo/GeoGig,markles/GeoGit