Fix REFRESH_WORKER documentation link

[HusamAamer]

Motivation

• Fix REFRESH_WORKER documentation link

Issues closed

[TimPietruskyRunPod]

The intent is right — the old link is dead — but the current diff produces an invalid markdown link because it nests [...](...) inside another [...](...).

Current:
```md
RunPod documentation
```

This renders broken (the inner [] becomes literal text in most markdown renderers).

It should be one of:

```md
RunPod documentation
```

Could you fix that to a single, flat link and also add a changeset entry? Once that's done I'll happily merge.

```md

"worker-comfyui": patch

docs: fix dead REFRESH_WORKER documentation link in docs/configuration.md.
```