fix verbiage in help

bin/vmail-domains-imp.sh

@@ -12,12 +12,12 @@ help()
 {
   thisfilename=$(basename -- "$0")
   echo "$thisfilename"
-  echo "Add domain to vmail system"
+  echo "Import domain to vmail system"
   echo ""
   echo "usage: $thisfilename -d <domain>"
   echo ""
   echo "  -h              Print this help."
-  echo "  -d              Domain to export from the vmail database."
+  echo "  -d              Domain to import."
   exit
 }