DOCS: use `limel-code-editor` instead of `textarea` in form example

[Kiarokh]

Current behavior

Expected behavior

👇

Environment

• lime-elements version:
• Framework used:
• Logs:

[Kiarokh]

I removed this for now from the cooldown board, and the review column

[LucyChyzhova]

@paulinewahle is it done? I see two PRs attached, what the status of them? 🙂 It says 'in progress' ...