Shift default sentence to be the last line

Co-Authored-By: Shi-Hao Hong <[email protected]>

Author: mono0926

packages/animations/lib/src/modal.dart

@@ -28,8 +28,8 @@ typedef _ModalTransitionBuilder = Widget Function(
 /// The `configuration` argument is used to determine characteristics of the
 /// modal route that will be displayed, such as the enter and exit
 /// transitions, the duration of the transitions, and modal barrier
-/// properties.
-/// By default, `configuration` is [FadeScaleTransitionConfiguration].
+/// properties. By default, `configuration` is
+/// [FadeScaleTransitionConfiguration].
 ///
 /// The `useRootNavigator` argument is used to determine whether to push the
 /// modal to the [Navigator] furthest from or nearest to the given `context`.