Change the notification format.

I find this format to be better.

mnpw/__init__.py

@@ -112,15 +112,15 @@ def main():  # noqa: MC0001
     elif check.ExitCode == nagios.NagiosCode.WARNING:
         logging.info("Check status is WARNING.")
         if args.warn and not args.dry_run:
-            notify(f"{check.Output} on {HOSTNAME}.")
+            notify(f"({HOSTNAME} {check.Output}")
     elif check.ExitCode == nagios.NagiosCode.CRITICAL:
         logging.info("Check status is CRITICAL.")
         if not args.dry_run:
-            notify(f"{check.Output} on {HOSTNAME}.")
+            notify(f"({HOSTNAME} {check.Output}")
     elif check.ExitCode == nagios.NagiosCode.UNKNOWN:
         logging.info("Check status is UNKNOWN.")
         if args.unknown and not args.dry_run:
-            notify(f"{check.Output} on {HOSTNAME}.")
+            notify(f"({HOSTNAME} {check.Output}")
     else:
         logging.info(
             f"Check status is invalid for a Nagios plugin ({check.ExitCode})."