Closes https://github.com/zed-industries/zed/issues/60777

# Objective

- Due to #59426, forcing docString softmark to hardmark, an regression
has appeared. It causes all docString on different language to load
newLine (`\n`) by default, instead of soft wrap.
- By checking the issue, turns out we should not setting
`soft_break_as_hard_break: true`, this will make the hover docString
less
- Details can refer to #60777 

## Solution

- Revert settings by removing the line in `hover_popover.rs:742`

## Testing

- About the testing result and comparsion, you can refer to #60777
- Updated test `test_hover_markdown_preserves_soft_breaks` to
`test_hover_markdown_soft_breaks_reflow_per_commonmark`

## 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

---

Release Notes:

- Fixed an issue where hover documentation could have too many line
breaks.

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Co-authored-by: zed-zippy[bot] <234243425+zed-zippy[bot]@users.noreply.github.com>