docs: Document how to use project-specific settings for Ruby LSP (#27310)

I think it's helpful to illustrate how some settings can be added to the
project settings file rather than being global.

Release Notes:

- N/A

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Co-authored-by: Peter Tripp <peter@zed.dev>
f19e1e3b5fAndy Waite committed on 3/23/2025, 6:54:55 PM· committed by GitHubparent8294b9f
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