docs: Update upgrade-to-v5.md

ref #9329

docs/docs/guides/upgrade-to-v5.md

@@ -71,10 +71,6 @@ NextAuth.js has had a few different ways to authenticate server-side in the past
 
 Now that Next.js components are **server-first** by default, and thanks to the investment in using standard Web APIs, we were able to simplify the authentication process to a single `auth()` function that you can use anywhere.
 
-:::note
-When using `auth()`, the [`session()` callback](/reference/core/types#session) is ignored. `auth()` will expose anything returned from the [`jwt()` callback](reference/core/types#jwt) or if using a [`"database"` strategy](/reference/core#session), from the [User](/reference/core/adapters#adapteruser). This is because the `session()` callback was designed to protect you from exposing sensitive information to the client, but when using `auth()` you are always on the server.
-:::
-
 See the table below for a summary of the changes, and click on the links to learn more about each one.
 
 | Where                                                         | v4                                                    | v5                               |