message: docs: fix typo in structural directive example
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diff: @@ -12,7 +12,7 @@ import { Directive, Input, TemplateRef, ViewContainerRef } from '@angular/core';
  * then the templated elements are removed removed from the DOM,
  * the templated elements are (re)inserted into the DOM.
  *
  - * <div *ngUnless="errorCount" class="success">
  + * <div *appUnless="errorCount" class="success">
  * Congrats! Everything is great!
  * </div>
  *
  