(Azure CXP) missing step for functionName param

resolves MicrosoftDocs/azure-docs#90172

Author: mikeurnun

articles/azure-functions/durable/durable-functions-create-portal.md

@@ -77,10 +77,10 @@ If you are creating JavaScript Durable Functions, you'll need to install the [`d
 1. Use an HTTP tool like Postman or cURL to send a POST request to the URL that you copied. The following example is a cURL command that sends a POST request to the durable function:
 
     ```bash
-    curl -X POST https://{your-function-app-name}.azurewebsites.net/api/orchestrators/HelloSequence --header "Content-Length: 0"
+    curl -X POST https://{your-function-app-name}.azurewebsites.net/api/orchestrators/{functionName} --header "Content-Length: 0"
     ```
 
-    In this example, `{your-function-app-name}` is the domain that is the name of your function app. The response message contains a set of URI endpoints that you can use to monitor and manage the execution, which looks like the following example:
+    In this example, `{your-function-app-name}` is the domain that is the name of your function app, and `{functionName}` is the **HelloSequence** orchestrator function. The response message contains a set of URI endpoints that you can use to monitor and manage the execution, which looks like the following example:
 
     ```json
     {