message: docs(animations): fix filter-animations docregion
  the filter animation example in the complex-animation-sequences guide
  talks about entering and leaving elements, but the presented html
  snipped exluded the *ngFor which actually adds and removes the elements,
  so add the *ngFor section to make the example complete and
  understandable
  PR Close
diff: placeholder="Search heroes">
  <ul class="heroes" [@filterAnimation]="heroesTotal">
  -<!-- #enddocregion filter-animations -->
  <li *ngFor="let hero of heroes" class="hero">
  <div class="inner">
  <span class="badge">{{ hero.id }}</span>
  <span>{{ hero.name }}</span>
  </div>
  </li>
  -<!-- #docregion filter-animations -->
  </ul>
  <!-- #enddocregion filter-animations -->
  