t.rast.what: correct user msg (fix 3337)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@70953 15284696-431f-4ddb-bdfa-cd5b030d7da7

temporal/t.rast.what/t.rast.what.py

@@ -146,7 +146,7 @@ def main(options, flags):
         gscript.fatal(_("Options coordinates and points are mutually exclusive"))
 
     if not coordinates and not points and not use_stdin: 
-        gscript.fatal(_("Please specify the coordinates, the points option or use the 's' option to pipe coordinate positions to t.rast.what from stdin, to provide the sampling coordinates"))
+        gscript.fatal(_("Please specify the coordinates, the points option or use the 'i' flag to pipe coordinate positions to t.rast.what from stdin, to provide the sampling coordinates"))
 
     if use_stdin:
         coordinates_stdin = str(sys.__stdin__.read())