Issue 25542. If an element does not have its own documentation, use the documentation from the over…

pkg/analysis_server/test/analysis/notification_overrides_test.dart

Index: pkg/analysis_server/test/analysis/notification_overrides_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_overrides_test.dart b/pkg/analysis_server/test/analysis/notification_overrides_test.dart
index 986e1997ce02a903bed7fa336f9728e14113d89e..61db5131d965aab71e8a917b83c33d2620912377 100644
--- a/pkg/analysis_server/test/analysis/notification_overrides_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_overrides_test.dart
@@ -370,7 +370,7 @@ class C implements B {
 ''');
     await prepareOverrides();
     assertHasOverride('m() {} // in C');
-    expect(override.interfaceMembers, hasLength(1));
+    expect(override.interfaceMembers, hasLength(2));
     assertHasInterfaceMember('m() {} // in B');
   }