fix(typo) desc of jumpToPage (#12320)

packages/flutter/lib/src/widgets/page_view.dart

@@ -101,10 +101,8 @@ class PageController extends ScrollController {
 
   /// Changes which page is displayed in the controlled [PageView].
   ///
-  /// The animation lasts for the given duration and follows the given curve.
-  /// The returned [Future] resolves when the animation completes.
-  ///
-  /// The `duration` and `curve` arguments must not be null.
+  /// Jumps the page position from its current value to the given value,
+  /// without animation, and without checking if the new value is in range.
   void jumpToPage(int page) {
     final _PagePosition position = this.position;
     position.jumpTo(position.getPixelsFromPage(page.toDouble()));