vim: Update `:set` (#27805)

Update VimSet commands to better match the other commands by displaying
the leading `:`:

|Before|After|
|--|--|

|![image](https://github.com/user-attachments/assets/1bc21a06-e71f-4e40-90a7-ffdd903fd7b5)|![image](https://github.com/user-attachments/assets/df59279f-d454-4701-8330-2529506850cd)|


Release Notes:

- N/A
7984f0f11c5brian committed on 4/1/2025, 1:00:11 AM· committed by GitHubparent37ebb47
1 file changedLine totals unavailable