[gthumb] --help: mention that user can open files and/or directories

[Paolo Bacchilega <paobac src gnome org>]

commit 815089cd823c19fdbf6dcfc00cd6617b284543fc
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Mar 20 13:26:22 2022 +0100

    --help: mention that user can open files and/or directories
    
    Fixes #167

 gthumb/gth-application.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gthumb/gth-application.c b/gthumb/gth-application.c
index 1ed57219..8cfbc258 100644
--- a/gthumb/gth-application.c
+++ b/gthumb/gth-application.c
@@ -68,8 +68,7 @@ static const GOptionEntry options[] = {
          N_("Show version"), NULL },
 
        { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &remaining_args,
-         NULL,
-         NULL },
+         NULL, N_("[FILE…] [DIRECTORY…]") },
 
        { NULL }
 };