Fix typo in hitTest docs (#145677)

This PR fixes the typo in the `hitTest` method documentation.

Author: ksokolovskyi

packages/flutter/lib/src/rendering/box.dart

@@ -2708,7 +2708,7 @@ abstract class RenderBox extends RenderObject {
   /// having been called in [hitTest] but cannot rely upon [paint] having been
   /// called. For example, a render object might be a child of a [RenderOpacity]
   /// object, which calls [hitTest] on its children when its opacity is zero
-  /// even through it does not [paint] its children.
+  /// even though it does not [paint] its children.
   bool hitTest(BoxHitTestResult result, { required Offset position }) {
     assert(() {
       if (!hasSize) {

packages/flutter/lib/src/rendering/sliver.dart

@@ -1390,7 +1390,7 @@ abstract class RenderSliver extends RenderObject {
   /// having been called in [hitTest] but cannot rely upon [paint] having been
   /// called. For example, a render object might be a child of a [RenderOpacity]
   /// object, which calls [hitTest] on its children when its opacity is zero
-  /// even through it does not [paint] its children.
+  /// even though it does not [paint] its children.
   ///
   /// ## Coordinates for RenderSliver objects
   ///