Add "tif" to p2g docs
Add "tif" to p2g docs

We can export tifs, so we should mention that in the docs.

jwomeara/PDAL,mpgerlek/PDAL-old,jwomeara/PDAL,DougFirErickson/PDAL,mtCarto/PDAL,DougFirErickson/PDAL,lucadelu/PDAL,radiantbluetechnologies/PDAL,mpgerlek/PDAL-old,boundlessgeo/PDAL,lucadelu/PDAL,Sciumo/PDAL,mpgerlek/PDAL-old,lucadelu/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,boundlessgeo/PDAL,radiantbluetechnologies/PDAL,mtCarto/PDAL,Sciumo/PDAL,jwomeara/PDAL,DougFirErickson/PDAL,mpgerlek/PDAL-old,radiantbluetechnologies/PDAL,Sciumo/PDAL,boundlessgeo/PDAL,mtCarto/PDAL,boundlessgeo/PDAL,jwomeara/PDAL,Sciumo/PDAL,mtCarto/PDAL,lucadelu/PDAL