adding noreferrer to missed anchor tag

Author: mchang16-auth

articles/_includes/_api_auth_intro.md

@@ -1,3 +1,3 @@
 ::: note
-**New to Auth0?** Learn <a href="/overview" target="_blank">how Auth0 works</a> and read about <a href="/api-auth" target="_blank" rel="noreferrer">implementing API authentication and authorization</a> using the OAuth 2.0 framework.
+**New to Auth0?** Learn <a href="/overview" target="_blank" rel="noreferrer">how Auth0 works</a> and read about <a href="/api-auth" target="_blank" rel="noreferrer">implementing API authentication and authorization</a> using the OAuth 2.0 framework.
 :::