[documentation] remove repeated "For example," in RenderSliverEdgeInsetsPadding documentation (#135297)
There was a repeated "For example," in the documentation of `RenderSliverEdgeInsetsPadding`. This PR fix this.
diff --git a/packages/flutter/lib/src/rendering/sliver_padding.dart b/packages/flutter/lib/src/rendering/sliver_padding.dart
index c02ee71..62540d9 100644
--- a/packages/flutter/lib/src/rendering/sliver_padding.dart
+++ b/packages/flutter/lib/src/rendering/sliver_padding.dart
@@ -18,7 +18,7 @@
///
/// {@template flutter.rendering.RenderSliverEdgeInsetsPadding}
/// Applying padding in the main extent of the viewport to slivers that have scroll effects is likely to have
-/// undesired effects. For example, For example, wrapping a [SliverPersistentHeader] with
+/// undesired effects. For example, wrapping a [SliverPersistentHeader] with
/// `pinned:true` will cause only the appbar to stay pinned while the padding will scroll away.
/// {@endtemplate}
abstract class RenderSliverEdgeInsetsPadding extends RenderSliver with RenderObjectWithChildMixin<RenderSliver> {
