[doc] Update uv feature flag description after 2.47 is released

### Search before asking

- [x] I had searched in the [issues](https://github.com/ray-project/kuberay/issues) and found no similar feature requirement.


### Description

https://github.com/ray-project/ray/pull/53303/files#r2121852166

### Use case

_No response_

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!