message: docs(split-pane): Remove reference to deprecated ion-page component
  The example for Split Pane Layout uses a deprecated tag that no longer exists in Ionic 4. By replacing `<ion-page class="ion-page" main>` with `<div class="ion-page" main>`, the example works as expected.
diff: @@ -200,7 +200,7 @@ By default, the split pane view will show when the screen is larger than `768px`
  </ion-content>
  </ion-menu>
  - <ion-page class="ion-page" main>
  + <div class="ion-page" main>
  <ion-header>
  <ion-toolbar>
  <ion-buttons slot="start">
  @@ -216,7 +216,7 @@ By default, the split pane view will show when the screen is larger than `768px`
  <ion-content class="ion-padding">
  <h1>Main Content</h1>
  </ion-content>
  - </ion-page>
  + </div>
  </ion-split-pane>
  </ion-app>
  