docs: update protocol and link (fixes #150) (#178)

Author: sinedied

README.md

@@ -14,6 +14,7 @@ urlFragment: azure-search-openai-javascript
 name: ChatGPT + Enterprise data (javascript)
 description: A javascript sample app that chats with your data using OpenAI and AI Search.
 ---
+
 <!-- YAML front-matter schema: https://review.learn.microsoft.com/en-us/help/contribute/samples/process/onboarding?branch=main#supported-metadata-fields-for-readmemd -->
 
 # ChatGPT + Enterprise data with Azure OpenAI and Azure AI Search
@@ -266,7 +267,7 @@ Once in the web app:
 
 ## Using a different backend
 
-The Search API service implements the [AzureML Chat Backend Protocol](https://github.com/Azure/azureml_run_specification/blob/chat-protocol/specs/chat-protocol/chat-app-protocol.md). It can be swapped with any service that implements the same protocol, like the [Python backend client in this repository](https://github.com/Azure-Samples/azure-search-openai-demo) instead of the Node.js implementation featured in this repo.
+The Search API service implements the [HTTP protocol for AI chat apps](https://github.com/Azure-Samples/ai-chat-app-protocol). It can be swapped with any service that implements the same protocol, like the [Python backend client in this repository](https://github.com/Azure-Samples/azure-search-openai-demo) instead of the Node.js implementation featured in this repo.
 
 To do so, follow these steps:
 
@@ -444,4 +445,4 @@ Here are the most common failure scenarios and solutions:
 
 1. After running `azd up` and visiting the website, you see a '404 Not Found' in the browser. Wait 10 minutes and try again, as it might be still starting up. Then try running `azd deploy` and wait again. If you still encounter errors with the deployed app, consult these [tips for debugging App Service app deployments](http://blog.pamelafox.org/2023/06/tips-for-debugging-flask-deployments-to.html) and file an issue if the error logs don't help you resolve the issue.
 
-1. You're getting an error `401 Principal does not have access to API/Operation` while running the project locally or trying to deploy. That's likely because your environment variables include `AZURE_TENANT_ID`, `AZURE_CLIENT_ID` and `AZURE_CLIENT_SECRET`. You should either grant permissions to the related *Service Principal* or remove these variables from your environment to ensure normal access. For more details, please refer to [Azure identity SDK](https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/identity/identity/README.md#defaultazurecredential). 
+1. You're getting an error `401 Principal does not have access to API/Operation` while running the project locally or trying to deploy. That's likely because your environment variables include `AZURE_TENANT_ID`, `AZURE_CLIENT_ID` and `AZURE_CLIENT_SECRET`. You should either grant permissions to the related _Service Principal_ or remove these variables from your environment to ensure normal access. For more details, please refer to [Azure identity SDK](https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/identity/identity/README.md#defaultazurecredential).