799af1ac09
The current description of `on: ready_for_review` may confuse readers because a workflow with `ready_for_review` should be written as below:
```yaml
on:
pull_request:
types: [ready_for_review]
```
- `pull_request` is an event
- `ready_for_review` is an event type of `pull_request`
Refs:
- https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#onevent_nametypes
- https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#pull_request