assistant: Improve Amazon Bedrock configuration instructions

[5herlocked]

Based on question, discussion here -- #16544 (comment)

Plus the fact that it wasn't clear to anyone who isn't familiar with AWS, updating the UX to more friendly and guided.

Release Notes:

• N/A

[zed-industries-bot]

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📖	This PR includes links to the following GitHub Issues: #16544 If this PR aims to close an issue, please include a Closes #ISSUE line at the top of the PR body.

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[maxdeviant]

@5herlocked Could you please include a screenshot of the changes?

[5herlocked]

Old

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New

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In my head I'd like the labels vs. the editors to be justified but I haven't given it much thought

[danilo-leal]

Oops, hadn't seen this before I opened #25745 — also touched on this there!

I like your changes, and mine are also hopefully an improvement, but I'm feeling like the ultimate/best fix for this is figuring out a more classic, web-like input component with label, input, and placeholder.

[5herlocked]

So long-term, we would actually prefer if the user never have to use this.
We're working on a crate that will integrate into the variety of ways people interact with AWS, think SSO, CLI, etc.

But I love your changes because it makes it feel a lot more "cozy"

[5herlocked]

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Merged the two, if we like it, we can send it -- imo looks pretty close to very good.

[danilo-leal]

Pushed an additional update here—looking ok for me!

Felt like keeping the "XXX" as placeholder because they (at least should) indicate the correct number of characters. Unsure whether we have actual, web-like validation to actually accept just a specific number, but at least indicating that is helpful.

[5herlocked]

Yeah definitely good shout --

If we want to actually have an exact number of Placeholder 'X's - Access Key Id is usually around 16 characters and Secret Access Key is around 40 characters.

If we wanted validation down the line -- https://github.com/awslabs/git-secrets/blob/5357e18bc27b42a827b6780564ea873a72ca1f01/git-secrets#L234

which also contains AWS approved examples for AAID and SK's