Update binary format documentation with 'tag'
Update binary format documentation with 'tag'

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