link proc_zombie in index

docs/20_Checks/_index.md

@@ -42,7 +42,7 @@ There is one include script used by all checks:
 * [check_php-fpm-status](check_php-fpm-status.md)
 * [check_proc_mem](check_proc_mem.md)
 * [check_proc_ressources](check_proc_ressources.md)
-* check_proc_zombie
+* [check_proc_zombie](check_proc_zombie.md)
 * [check_psqlserver](check_psqlserver.md)
 * [check_rearbackup](check_rearbackup.md)
 * [check_reboot_required](check_reboot_required.md)