[Bug]: REST plugin reference is broken on the website

### Steps to reproduce

https://dstack.ai/docs/reference/plugins/rest/

### Actual behaviour

<img width="935" height="363" alt="Image" src="https://github.com/user-attachments/assets/b748785e-6e29-4593-8d4c-74ea0905d0a9" />

### Expected behaviour

_No response_

### dstack version

0.20.15

### Server logs

```shell

```

### Additional information

_No response_