docs: add mention of the HTTP client for interceptors (angular#55551)

fixes angular#53911

PR Close angular#55551

Author: JeanMeche

adev/src/content/tutorials/first-app/steps/14-http/README.md

@@ -196,6 +196,8 @@ The server is now reading data from the HTTP request but the components that rel
 
 </docs-workflow>
 
+Note: This lesson relies on the `fetch` browser API. For the support of interceptors, please refer to the [Http Client documentation](/guide/http)
+
 Summary: In this lesson, you updated your app to use a local web server (`json-server`), and use asynchronous service methods to retrieve data.
 
 Congratulations! You've successfully completed this tutorial and are ready to continue your journey with building even more complex Angular Apps.