Docs (RenderObject): minor fix and link to more information (#49992)

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

diff --git a/packages/flutter/lib/src/rendering/object.dart b/packages/flutter/lib/src/rendering/object.dart
index 1f9e12d..76afea1 100644
--- a/packages/flutter/lib/src/rendering/object.dart
+++ b/packages/flutter/lib/src/rendering/object.dart
@@ -1917,6 +1917,8 @@
   /// the framework.
   ///
   /// Warning: This getter must not change value over the lifetime of this object.
+  ///
+  /// See [RepaintBoundary] for more information about how repaint boundaries function.
   bool get isRepaintBoundary => false;
 
   /// Called, in checked mode, if [isRepaintBoundary] is true, when either the
@@ -2692,7 +2694,7 @@
   /// invisible).
   ///
   /// The default implementation mirrors the behavior of
-  /// [visitChildren()] (which is supposed to walk all the children).
+  /// [visitChildren] (which is supposed to walk all the children).
   void visitChildrenForSemantics(RenderObjectVisitor visitor) {
     visitChildren(visitor);
   }