chore: fix lint in docs

Author: jkeen

docs/app/components/docs/manual-position-control.js

@@ -5,7 +5,7 @@ export default class DocsCustomPositionControlComponent extends Component {
   @tracked lastSelectedPosition;
 
   @action
-  onChangePosition(position, event) {
+  onChangePosition(position /* event */) {
     this.lastSelectedPosition = position;
   }
 }

test-app/tests/integration/helpers/sound-position-timestamp-test.js

@@ -1,7 +1,7 @@
 import { module, test } from 'qunit';
 import { setupRenderingTest } from 'ember-qunit';
 import { setupStereoTest } from 'ember-stereo/test-support/stereo-setup';
-import { render, settled } from '@ember/test-helpers';
+import { render } from '@ember/test-helpers';
 import { hbs } from 'ember-cli-htmlbars';
 import { add } from 'date-fns';