cleanup: Fixup wrong JSDoc comments

There are a handful of JSDoc comments that are invalid or don't
conform to the configured format. Fix them to remove the last
remaining bit of legacy configuration.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2866>

js/dbusServices/dbusService.js

@@ -59,13 +59,12 @@ export class ServiceImplementation {
     }
 
     /**
-     * _handleError:
-     * @param {Gio.DBusMethodInvocation}
-     * @param {Error}
-     *
      * Complete @invocation with an appropriate error if @error is set;
      * useful for implementing early returns from method implementations.
      *
+     * @param {Gio.DBusMethodInvocation}
+     * @param {Error}
+     *
      * @returns {bool} - true if @invocation was completed
      */