Merge pull request #5813 from RealBrubru/patch-1

Update headerFooterBar.js

Author: danbucholtz

js/angular/directive/headerFooterBar.js

@@ -34,7 +34,7 @@ IonicModule
  *     <button class="button">Right Button</button>
  *   </div>
  * </ion-header-bar>
- * <ion-content>
+ * <ion-content class="has-header">
  *   Some content!
  * </ion-content>
  * ```
@@ -61,7 +61,7 @@ IonicModule
  *
  * @usage
  * ```html
- * <ion-content>
+ * <ion-content class="has-footer">
  *   Some content!
  * </ion-content>
  * <ion-footer-bar align-title="left" class="bar-assertive">