Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments (N/A — docs only)
- [x] 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 (N/A — docs only)
- [x] Performance impact has been considered and is acceptable

Documents the `llvm-objcopy --strip-debug` step that
`script/bundle-linux` runs after `cargo build`. Without it, self-built
`remote_server` binaries are ~462 MB instead of ~62 MB and behave
differently from the prebuilt downloads.

Two contributors converged on the same fix in the issue thread; this PR
is a docs-only version of their suggestion, plus the musl/static variant
that `script/bundle-linux` actually uses for the official Linux release.

Closes #56939

Release Notes:

- N/A

AI was used for assistance.

Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
Co-authored-by: Lukas Wirth <lukas@zed.dev>