Add doc links to RawGestureDetector (#81796)

diff --git a/packages/flutter/lib/src/gestures/recognizer.dart b/packages/flutter/lib/src/gestures/recognizer.dart
index 3d41f8e..acd74d4 100644
--- a/packages/flutter/lib/src/gestures/recognizer.dart
+++ b/packages/flutter/lib/src/gestures/recognizer.dart
@@ -51,7 +51,8 @@
 ///
 /// See also:
 ///
-///  * [GestureDetector], the widget that is used to detect gestures.
+///  * [GestureDetector], the widget that is used to detect built-in gestures.
+///  * [RawGestureDetector], the widget that is used to detect custom gestures.
 ///  * [debugPrintRecognizerCallbacksTrace], a flag that can be set to help
 ///    debug issues with gesture recognizers.
 abstract class GestureRecognizer extends GestureArenaMember with DiagnosticableTreeMixin {
diff --git a/packages/flutter/lib/src/widgets/gesture_detector.dart b/packages/flutter/lib/src/widgets/gesture_detector.dart
index fc32844..c9d1185 100644
--- a/packages/flutter/lib/src/widgets/gesture_detector.dart
+++ b/packages/flutter/lib/src/widgets/gesture_detector.dart
@@ -201,6 +201,7 @@
 ///  * [Listener], a widget for listening to lower-level raw pointer events.
 ///  * [MouseRegion], a widget that tracks the movement of mice, even when no
 ///    button is pressed.
+///  * [RawGestureDetector], a widget that is used to detect custom gestures.
 class GestureDetector extends StatelessWidget {
   /// Creates a widget that detects gestures.
   ///