Update winget installation instructions (#56)

- Use `--source winget` so Microsoft Store is not considered
- Use `--id yt-dlp.yt-dlp` to avoid collisions
- Mention that regular updating via `yt-dlp` is still possible

Installation.md

@@ -182,12 +182,16 @@ choco upgrade yt-dlp
 ### [winget](https://docs.microsoft.com/en-us/windows/package-manager/winget/)
 
 ```powershell
-winget install yt-dlp
+winget install --source winget --id yt-dlp.yt-dlp
 ```
 
 To update, run:
 ```powershell
-winget upgrade yt-dlp
+winget upgrade --source winget --id yt-dlp.yt-dlp
+```
+You can also update using the yt-dlp executable's built-in updater:
+```
+yt-dlp -U
 ```
 
 ## Android