startup: update syntax for `-c`

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@45728 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/init/grass.py

@@ -121,7 +121,7 @@ def gfile(*args):
 
 help_text = r"""
 %s:
-  $CMD_NAME [-h | -help | --help] [-v | --version] [-c]
+  $CMD_NAME [-h | -help | --help] [-v | --version] [-c | -c geofile | -c EPSG:code]
 	  [-text | -gui]
 	  [[[<GISDBASE>/]<LOCATION_NAME>/]<MAPSET>]