docs: Add note about `CLAUDE.md` usage (#37496)

Some users asked whether Claude Code in Zed can also observe/consume
`CLAUDE.md` guidelines, regardless of whether they're at the root
`.claude` directory or within the project. Answer is yes and the
documentation will mention it now!

Release Notes:

- N/A
3b7dbb87b0Danilo Leal committed on 9/3/2025, 9:31:54 PM· committed by GitHubparentbb13228
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