docs: Improve the Linux uninstall instructions (#63109)

# Objective

- Fixes incorrect Linux uninstall instructions.

## Solution

- Fixes a typo in the instructions and clarifies the correct uninstall
method when having parallel installations on Linux.

## Testing

- I tested the commands. :man_shrugging: 

## 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
bcf033f8a0Johnny Arcitec committed on 8/23/2026, 6:51:12 PM· committed by GitHubparentd9ad6af
1 file changedLine totals unavailable