## Objective

Make the `"..."` convention easier to understand across the settings
that support it.

This is a meta follow-up to
[#64399](https://github.com/zed-industries/zed/discussions/64399),
establishing a documentation pattern that subsequent PRs can follow.

## Solution

Give each setting a succinct, self-contained explanation of `"..."`,
with matching wording and examples in its Rust doc comment and settings
reference:

- `file_scan_exclusions` • #62769
- `file_scan_inclusions` • #64440
- `read_only_files` • #64222

This keeps the explanation consistent across both surfaces and aligns
the content for future documentation generated from Rust comments.

## Testing

Built the docs locally on macOS and verified the examples, links, and
anchors. The existing settings merge tests pass.

## Self-Review Checklist:

- [x] I’ve reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed’s UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

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Release Notes:

- N/A