Quickstart page doesn't clarify that the Functions tab uses a deprecated API

[knisaci]

Description

The Snaps quickstart page shows two code examples — JSX and Functions.
The "Functions" tab uses panel() and text() from @metamask/snaps-sdk,
which is the older deprecated approach. However, there is no note or warning
telling readers that the JSX approach is preferred and the Functions API
is legacy/deprecated.

Page URL

https://docs.metamask.io/snaps/get-started/quickstart/

Expected behavior

Add a deprecation note or warning on the "Functions" tab making it clear
that JSX is the recommended approach for new Snaps, and that the
Functions-based API is maintained for legacy purposes only.

Why this matters

New developers copying the Functions example may use a deprecated pattern
without realizing it, leading to confusion later.

[Root-Aamir]

Hi, I would like to work on this by adding a short note to the Quickstart page clarifying that the Functions tab uses the legacy/deprecated API and that JSX is recommended for new Snaps.