fix(docs-infra): amend notification close button aria-label (#45579) (#…

…45654)

move the aria-label used inside the close-button to the button itself
(since otherwise the button's aria-label overrides the childs)

PR Close #45579

PR Close #45654

aio/src/app/layout/notification/notification.component.html

@@ -2,6 +2,6 @@
   <ng-content></ng-content>
 </span>
 
-<button mat-icon-button class="close-button" aria-label="Close" (click)="dismiss()">
-  <mat-icon svgIcon="close" aria-label="Dismiss notification"></mat-icon>
+<button mat-icon-button class="close-button" aria-label="Dismiss notification" (click)="dismiss()">
+  <mat-icon svgIcon="close"></mat-icon>
 </button>