Fix for updating documentationComment for top-level variables.

pkg/analyzer/test/generated/incremental_resolver_test.dart

Index: pkg/analyzer/test/generated/incremental_resolver_test.dart
diff --git a/pkg/analyzer/test/generated/incremental_resolver_test.dart b/pkg/analyzer/test/generated/incremental_resolver_test.dart
index 3a06df4942d6ceda339523e3057f305de85c805a..10c227e95d3d86e54df8e868e751c8efe9fd248f 100644
--- a/pkg/analyzer/test/generated/incremental_resolver_test.dart
+++ b/pkg/analyzer/test/generated/incremental_resolver_test.dart
@@ -578,6 +578,22 @@ class A {
 ''');
   }
 
+  void test_dartDoc_beforeTopLevelVariable() {
+    _resolveUnit(r'''
+/**
+ * Variables [V1] and [V2] of type [int].
+ */
+int V1, V2;
+''');
+    _updateAndValidate(r'''
+/**
+ * Variables [V1] and [V2] of type [int].
+ * Updated, with a reference to the [String] type.
+ */
+int V1, V2;
+''');
+  }
+
   void test_dartDoc_clumsy_addReference() {
     _resolveUnit(r'''
 /**