[monitoring-plugins] Add -C to general usage hints

[Lorenz Kästle]

 Module: monitoring-plugins
 Branch: master
 Commit: 2ef36843abf3b2ec7142aa2f52b66d5d3c7b543b
 Author: Lorenz Kästle <lorenz.kaestle at netways.de>
   Date: Thu Sep 21 09:50:53 2023 +0200
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=2ef3684

Add -C to general usage hints

---

 plugins/check_disk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/check_disk.c b/plugins/check_disk.c
index b3edc41..7dc1c4b 100644
--- a/plugins/check_disk.c
+++ b/plugins/check_disk.c
@@ -1012,7 +1012,7 @@ print_help (void)
   printf ("%s\n", _("General usage hints:"));
   printf (" %s\n", _("- Arguments are positional! \"-w 5 -c 1 -p /foo -w6 -c2 -p /bar\" is not the same as"));
   printf ("   %s\n", _("\"-w 5 -c 1 -p /bar w6 -c2 -p /foo\"."));
-  printf (" %s\n", _("- The syntax is broadly: \"{thresholds a} {paths a} {thresholds b} {thresholds b} ...\""));
+  printf (" %s\n", _("- The syntax is broadly: \"{thresholds a} {paths a} -C {thresholds b} {thresholds b} ...\""));