chore: Update bun.mdx

[jacobdalamb]

Description (required)

Simplified recipe and clarified CLI commands

Related issues & labels (optional)

• Closes #
• Suggested label: improve or update documentation

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[yanthomasdev]

Removed [en-only] from the PR since this would mean it wouldn't mark this page's translations as outdated if we merge your contribution.

[sarah11918]

Thanks @jacobdalamb , these instructions look really nicely done! Mostly added some inline code syntax for commands etc.

I'll just commit these small fixes so we can get this published right away! 🎉