Update documentation for InvocationExpression and implicit setters

pkg/kernel/lib/ast.dart

Index: pkg/kernel/lib/ast.dart
diff --git a/pkg/kernel/lib/ast.dart b/pkg/kernel/lib/ast.dart
index 0112b5a7286a9cfd651dfbe5f032e6e43bbf8ae5..3b812e2bed55d61414ca800eb61c7099f6278755 100644
--- a/pkg/kernel/lib/ast.dart
+++ b/pkg/kernel/lib/ast.dart
@@ -784,7 +784,7 @@ class Field extends Member {
   /// setter is not necessarily final, as it may be mutated by direct field
   /// access.
   ///
-  /// By default, all non-static, non-final fields have implicit getters.
+  /// By default, all non-static, non-final fields have implicit setters.
   bool get hasImplicitSetter => flags & FlagHasImplicitSetter != 0;
 
   void set isFinal(bool value) {
@@ -1934,8 +1934,8 @@ class NamedExpression extends TreeNode {
   }
 }
 
-/// Common super class for [MethodInvocation], [SuperMethodInvocation],
-/// [StaticInvocation], and [ConstructorInvocation].
+/// Common super class for [DirectMethodInvocation], [MethodInvocation],
+/// [SuperMethodInvocation], [StaticInvocation], and [ConstructorInvocation].
 abstract class InvocationExpression extends Expression {
   Arguments get arguments;
   set arguments(Arguments value);