Update External Durable Client ReadMe.md (#2865)

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samples/durable-client-managed-identity/functions-app/README.md

@@ -13,22 +13,22 @@ This project demonstrates an Azure Function App that invokes a Durable Function
     - Storage Table Data Contributor
 
 3. Link your storage account to your Function App by adding either of these two details to your `local.settings.json` file (for local development) or as environment variables in your Function App settings in Azure.
-    - AzureWebJobsStorage__accountName
-    - AzureWebJobsStorage__blobServiceUri, AzureWebJobsStorage__queueServiceUri and AzureWebJobsStorage__tableServiceUri
+    - \<StorageConnectionName\>__accountName
+    - \<StorageConnectionName\>__blobServiceUri, \<StorageConnectionName\>__queueServiceUri and \<StorageConnectionName\>__tableServiceUri
 
 4. Add the required identity information to your Functions App configuration.
     - system-assigned identity: nothing needs to be provided.
     - user-assigned identity: 
-      - AzureWebJobsStorage__credential: managedidentity
-      - AzureWebJobsStorage__clientId
+      - \<StorageConnectionName\>__credential: managedidentity
+      - \<StorageConnectionName\>__clientId
     - client secret application:
-      - AzureWebJobsStorage__clientId
-      - AzureWebJobsStorage__ClientSecret
-      - AzureWebJobsStorage__tenantId
+      - \<StorageConnectionName\>__clientId
+      - \<StorageConnectionName\>__ClientSecret
+      - \<StorageConnectionName\>__tenantId
 
 
 ## Notes
 
 - The Azure Functions runtime requires a storage account to start, with the default connection name `Storage`.
 - The Durable Client injected also requires a storage account, with the same default connection name `Storage`. However, you can use a custom connection name for a separate storage account as runtime for the durable client. For example, in this sample we use custom name `ClientStorage`.
-
+- To provide the necessary connection information, use the format `<StorageConnectionName>__<SettingName>`, as shown in local.settings.json. For example, if you want to specify the accountName, then add the setting `<StorageConnectionName>__accountName`.