[monitoring-plugins] Fix a typo in help of check_mailq.

[RincewindsHat]

    Module: monitoring-plugins
    Branch: check_mailq_domain_specific_warnings
    Commit: 17d0a181071ebec9f1215d61905b27582cabde5e
    Author: Tobias Stein <grand.ouvert at googlemail.com>
 Committer: RincewindsHat <12514511+RincewindsHat at users.noreply.github.com>
      Date: Fri Feb  7 14:28:47 2020 +0100
       URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=17d0a18

Fix a typo in help of check_mailq.

* Change help from "--Critcal-domain" to "--critical-domain".

---

 plugins-scripts/check_mailq.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins-scripts/check_mailq.pl b/plugins-scripts/check_mailq.pl
index 820f89b..6e771db 100755
--- a/plugins-scripts/check_mailq.pl
+++ b/plugins-scripts/check_mailq.pl
@@ -667,7 +667,7 @@ sub print_help () {
 	print "-w (--warning)         = Min. number of messages in queue to generate warning\n";
 	print "-c (--critical)        = Min. number of messages in queue to generate critical alert ( w < c )\n";
 	print "-W (--warning-domain)  = Min. number of messages for same domain in queue to generate warning\n";
-	print "-C (--Critical-domain) = Min. number of messages for same domain in queue to generate critical alert ( W < C )\n";
+	print "-C (--critical-domain) = Min. number of messages for same domain in queue to generate critical alert ( W < C )\n";
 	print "-t (--timeout)         = Plugin timeout in seconds (default = $utils::TIMEOUT)\n";
 	print "-M (--mailserver)      = [ sendmail | qmail | postfix | exim | nullmailer ] (default = autodetect)\n";
 	print "-s (--sudo)            = Use sudo to call the mailq command\n";