docs: mark Online Access as Early Access

Online Access (Online Refresh Tokens) is gated behind Auth0 account team
enablement. Adds the same Early Access notice used for the MFA section.

Author: NandanPrabhu

EXAMPLES.md

@@ -786,6 +786,9 @@ MRRT is disabled by default. To enable it, set the `useMrrt` option to `true` wh
 
 ## Online Access (Online Refresh Tokens)
 
+> [!NOTE]
+> Online Access (Online Refresh Tokens) support via SDKs is currently in Early Access. To request access to this feature, contact your Auth0 representative.
+
 **Online Refresh Tokens (ORTs)** are a refresh token type bound to the lifetime of the user's Auth0 session, unlike the rotating offline refresh tokens described above. An ORT is:
 
 - **Session-bound** — valid only while the underlying Auth0 session is active. When the session ends (logout, idle/absolute session expiry, or an admin revoking the session), the ORT stops working.