docs: Remove Alpine, clean up glibc guidance, minor wording fixes (#56674)

Self-Review Checklist:

- [ ] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments
- [ ] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [ ] Performance impact has been considered and is acceptable

Release Notes:
- N/A

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Co-authored-by: Martin Ye <martin@zed.dev>
53f1ae01a4allison committed on 6/10/2026, 10:12:21 PM· committed by GitHubparent20a3f77
1 file changedLine totals unavailable