Update howto-geo-replication.md

Author: mrm9084

articles/azure-app-configuration/howto-geo-replication.md

@@ -96,6 +96,8 @@ Assuming you have an application using Azure App Configuration, you can update i
 
 Edit the call to the `AddAzureAppConfiguration` method, which is often found in the `program.cs` file of your application.
 
+**Connect with AD**
+
 ```csharp
 configurationBuilder.AddAzureAppConfiguration(options =>
 {
@@ -109,7 +111,12 @@ configurationBuilder.AddAzureAppConfiguration(options =>
 
     // Other changes to options
 });
+```
+
+**Connect with Connection String**
 
+
+```csharp
 configurationBuilder.AddAzureAppConfiguration(options =>
 {
     // Provide an ordered list of replica connection strings