Update Obsolete attribute message

src/Workspaces/Core/Portable/SolutionCrawler/ServiceFeatureOnOffOptions.cs

@@ -8,7 +8,7 @@ internal static class ServiceFeatureOnOffOptions
         /// <summary>
         /// This option is used by TypeScript.
         /// </summary>
-        [Obsolete("Use the new option SolutionCrawlerOptions.BackgroundAnalysisScopeOption")]
+        [Obsolete("Currently used by TypeScript - should move to the new option SolutionCrawlerOptions.BackgroundAnalysisScopeOption")]
         public static readonly PerLanguageOption<bool?> ClosedFileDiagnostic = new PerLanguageOption<bool?>(
             "ServiceFeaturesOnOff", "Closed File Diagnostic", defaultValue: null,
             storageLocations: new RoamingProfileStorageLocation("TextEditor.%LANGUAGE%.Specific.Closed File Diagnostic"));