Add turn on/off thinking mode config for qwen3-30b-a3b-fp8

### Existing documentation URL(s)

https://developers.cloudflare.com/workers-ai/models/qwen3-30b-a3b-fp8/

### What changes are you suggesting?

qwen3-30b-a3b-fp8 have reasoning feature but in the docs dont show config how to turn it on or off, if follow the doc, we just let it give thinking content by default

in input parameter, we must add this config to the docs:

### Additional information

_No response_