Remove double heading (#146441)

The heading is already included in the macro.

## Old:
![Screenshot 2024-04-08 at 10 03 12 AM](https://github.com/flutter/flutter/assets/1227763/30108439-59e7-43b3-9ba5-fe57e04e7f10)
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Michael Goderbauer 2024-04-08 10:48:08 -07:00 committed by GitHub
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commit 5b5dff05b7
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@ -1412,8 +1412,6 @@ void runApp(Widget app) {
/// calling [runWidget] with a [ViewCollection] that does not specify any
/// [ViewCollection.views].
///
/// ## Dismissing Flutter UI via platform native methods
///
/// {@macro flutter.widgets.runApp.dismissal}
///
/// To release resources more eagerly, establish a [platform channel](https://flutter.dev/platform-channels/)