Apply suggestions from code review

Author: bene2k1

tutorials/configure-nagios-monitoring/index.mdx

@@ -224,4 +224,4 @@ On the remote server:
 ### Verify the setup
 - Go to the Nagios web interface (`http://your.server.ip.address/nagios`)
 - Check under Hosts to see if the remote server is listed.
--- Check under Services to verify if CPU usage monitoring is working.
+- Check under Services to verify if CPU usage monitoring is working.