docs: update example to use correct constructor arguments

Signed-off-by: Jason C. Nucciarone <[email protected]>

lib/charms/operator_libs_linux/v0/juju_systemd_notices.py

@@ -42,7 +42,7 @@ def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
 
         # Register services with charm. This adds the events to observe.
-        self._systemd_notices = SystemdNotices(self, Service("snap.slurm.slurmd", alias="slurmd"))
+        self._systemd_notices = SystemdNotices(self, [Service("snap.slurm.slurmd", alias="slurmd")])
         self.framework.observe(self.on.install, self._on_install)
         self.framework.observe(self.on.stop, self._on_stop)
         self.framework.observe(self.on.service_slurmd_started, self._on_slurmd_started)