message: docs(aio): add class attribute to example referenced in Structural Directive guide
  See
  From the structural-directives.md:
  The rest of the <div>, including its class attribute, moved inside the <ng-template> element.
  Maybe this made sense at one time but it has become out of sync.
  PR Close
diff: <blockquote>
  <!-- #docregion built-in, asterisk, ngif -->
  -<div *ngIf="hero" >{{hero.name}}</div>
  +<div *ngIf="hero" class="name">{{hero.name}}</div>
  <!-- #enddocregion built-in, asterisk, ngif -->
  </blockquote>
  <p>&lt;ng-template&gt; element</p>
  <!-- #docregion ngif-template -->
  <ng-template [ngIf]="hero">
  - <div>{{hero.name}}</div>
  + <div class="name">{{hero.name}}</div>
  </ng-template>
  <!-- #enddocregion ngif-template -->
  