📝 Add missing highlights in docs/en/docs/tutorial/security/oauth2-jwt.md

[Skyvastern]

In oauth2-jwt.md or the following page - https://fastapi.tiangolo.com/tutorial/security/oauth2-jwt/#update-the-dependencies the addition of TokenData class is not highlighted. So I added the highlights (in Update the dependencies section) as this was the place where TokenData class was first used. It's used in the function get_current_user.

[tiangolo]

📝 Docs preview for commit 777eac4 at: https://27e1a622.fastapitiangolo.pages.dev

[tiangolo]

📝 Docs preview for commit d2e1bc1 at: https://022e4cfc.fastapitiangolo.pages.dev

[tiangolo]

Thanks @Skyvastern! But the highlights are there as I intended, to focus on the specific function that the text is referring to. So I'll pass on this one, but thanks for the effort! ☕