fixed the default description

plugins/modules/mount.py

@@ -41,7 +41,7 @@ class Module(SystemdUnitModule, SystemdReloadMixin):  # type: ignore
         self.unitfile = SYSTEMD_SERVICE_CONFIG.joinpath(self.mountdir.relative_to("/").as_posix().replace("/", "-")).with_suffix(".mount")
         self.__unit = None
         if self.get("description", False) is False:
-            self.params["description"] = "Mount for {}".format(self.mountdir.relative_to("/").as_posix())
+            self.params["description"] = "Mount for {}".format(self.mountdir.as_posix())
 
     def unit(self) -> str:
         if self.__unit is None: