message: docs: temporarily hide banner to improve survey visibility
  PR Close
diff: <header>
  <mat-toolbar #appToolbar color="primary" class="app-toolbar no-print" [class.transitioning]="isTransitioning">
  <mat-toolbar-row class="notification-container">
  - <aio-notification notificationId="war-ukraine" expirationDate="null" [dismissOnContentClick]="false" (dismissed)="notificationDismissed()">
  + <aio-notification notificationId="war-ukraine" expirationDate="2022-09-26" [dismissOnContentClick]="false" (dismissed)="notificationDismissed()">
  <a class="link" target="_blank" rel="noopener" href="https://www.google.org/ukraine-relief/">
  <span class="title">Support Ukraine</span>
  <mat-icon class="icon" aria-label="Ukraine flag">
  