Update add-template-to-azure-pipelines.md

Updating the parameters so it compiles and follows the proper yaml structure

Author: aj-enns

articles/azure-resource-manager/bicep/add-template-to-azure-pipelines.md

@@ -63,7 +63,9 @@ You can use Azure Resource Group Deployment task or Azure CLI task to deploy a B
     name: Deploy Bicep files
 
     parameters:
-      azureServiceConnection: '<your-connection-name>'
+    - name: azureServiceConnection
+      type: string
+      default: '<your-connection-name>'
 
     variables:
       vmImageName: 'ubuntu-latest'