[docs]: update support gpu in wsl2 (#589)

# Pull Request

## What problem does this PR solve?

Issue Number: Fixed #
Add support WSL2 with GPU document.

## Possible side effects?

- Performance:

- Backward compatibility:

Author: Mingbo-Lee

README.md

@@ -34,7 +34,7 @@ This documentation also contains instructions for [build and testing](CONTRIBUTI
 |            | Linux x86_64 | Linux aarch64 | macOS x64      | macOS Apple Silicon | Windows x64    | Windows WSL2    x64 |
 |------------|--------------|---------------|----------------|---------------------|----------------|---------------------|
 | CPU        | yes          | yes           | yes<sup>1</sup>| yes                 | no             | yes                 |
-| NVIDIA GPU | experimental | no            | no             | n/a                 | no             | no                  |
+| NVIDIA GPU | experimental | no            | no             | n/a                 | no             | experimental                  |
 
 1. Due to CI resource limitation, macOS x64 prebuild binary will no longer available since next release (0.9.x).