Supplement missing separators for UV_INSTALL_DIR in Windows. (#9507)

## Summary
Ensure proper separation between instructions.
fix #9503 
## Test Plan
Both Windows Powershell (v5) and powershell 7 are available

![image](https://github.com/user-attachments/assets/9a73ea6f-8bee-49a1-b6d4-050317176cd6)



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FishAlchemist 2024-12-19 23:53:49 +08:00 committed by GitHub
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@ -17,7 +17,7 @@ To change the installation path, use `UV_INSTALL_DIR`:
=== "Windows"
```powershell
$env:UV_INSTALL_DIR = "C:\Custom\Path" powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
powershell -ExecutionPolicy ByPass -c {$env:UV_INSTALL_DIR = "C:\Custom\Path";irm https://astral.sh/uv/install.ps1 | iex}
```
## Disabling shell modifications