docs: Clarify build system specific features usage. (#10261)
## Summary
Since there are occasional inquiries about how to configure UV for
build-system specific features, I want to raise awareness that users
should refer to the documentation of the build system they are using for
relevant settings.
## Test Plan
Run docs service in local.
https://github.com/astral-sh/uv/pull/10261/commits/9821d58d35dce6bbafe4bdadd9031afba0f787a5
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Signed-off-by: FishAlchemist <48265002+FishAlchemist@users.noreply.github.com>
Co-authored-by: Zanie Blue <contact@zanie.dev>
