docs: fix doc tags

ionic/components/item/item-swipe-buttons.ts

@@ -5,10 +5,10 @@ import {SlideGesture} from 'ionic/gestures/slide-gesture';
 
 /**
  * @name ionPrimarySwipeButtons
- * @classdesc
+ * @description
  * Creates a swipeable button inside a list item, that is visible when the item is swiped to the left by the user. Swiped open buttons can be hidden with `setOpen(false)`.
  *
- * @example
+ * @usage
  * TODO
  */
 @Directive({

ionic/components/item/item.ts

@@ -6,11 +6,11 @@ import {dom} from 'ionic/util';
 
 /**
  * @name ionItem
- * @classdesc
+ * @description
  * Creates a list-item that can easily be swiped,
  * deleted, reordered, edited, and more.
  *
- * @example
+ * @usage
  * ```html
  * <ion-list>
  *   <ion-item *ng-for="#item of items" (^click)="itemTapped($event, item)">