fix highlight on bulk insert

Author: diberry

articles/search/tutorial-csharp-create-load-index.md

@@ -62,7 +62,7 @@ The script uses the Azure SDK for Cognitive Search:
     * YOUR-SEARCH-RESOURCE-NAME
     * YOUR-SEARCH-ADMIN-KEY
 
-    :::code language="csharp" source="~/azure-search-dotnet-samples/search-website-functions-v4/bulk-insert/Program.cs" highlight="16-19" :::
+    :::code language="csharp" source="~/azure-search-dotnet-samples/search-website-functions-v4/bulk-insert/Program.cs" highlight="16-19, 21-23, 32, 49" :::
 
 1. Open an integrated terminal in Visual Studio Code for the project directory's subdirectory, `search-website-functions-v4/bulk-insert`, then run the following command to install the dependencies.