comments about nasty gotcha in alternate ogr2ogr solution (merge from devbr6)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@34139 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/v.out.gps/v.out.gps

@@ -274,8 +274,10 @@ fi
 # BUG: cat is being reported as evelation and attribute output is skipped.
 #   (v.out.ogr DB reading bug)
 #   v.out.ogr -> shapefile -> GPX works, but we try to avoid that as it's
-#     lossy. Also that would allow -a_srs $IN_PROJ -t_srs EPSG:4326 so
-#     skip m.proj pains..
+#     lossy. Also that would allow ogr2ogr -a_srs $IN_PROJ -t_srs EPSG:4326
+#     so skip m.proj pains.. if that is done ogr2ogr -a_srs MUST HAVE +wktext
+#     with PROJ.4 terms or else the +nadgrids will be ignored! (best to feed
+#     it g.proj -wf) in that case.
 
 g.message -v "Exporting data ..."