docs(api): add links to component sections

ionic/components/nav/nav-controller.ts

@@ -97,6 +97,7 @@ import {raf, rafFrames} from '../../util/dom';
  * - `onPageWillUnload` - Runs when the page is about to be destroyed and have its elements removed.
  * - `onPageDidUnload` - Runs after the page has been destroyed and its elements have been removed.
  *
+ * @see {@link /docs/v2/components#navigation Navigation Component Docs}
  */
 export class NavController extends Ion {
 

ionic/components/nav/nav-push.ts

@@ -36,6 +36,7 @@ import {NavRegistry} from './nav-registry';
  * ```html
  * <button [nav-push]="[pushPage, params]"></button>
  * ```
+ * @see {@link /docs/v2/components#navigation Navigation Component Docs}
  */
 @Directive({
   selector: '[nav-push]',

ionic/components/nav/nav.ts

@@ -96,6 +96,7 @@ import {ViewController} from './view-controller';
  *   </pre>
  * </div>
  *
+ * @see {@link /docs/v2/components#navigation Navigation Component Docs}
  */
 @ConfigComponent({
   selector: 'ion-nav',