It is difficult to create a new Github app with the current documentation

[Hanh94]

Hi, I'm using create-probot-app created a checks - js App, but I find it hard to through the existing document to use rest API, such as I want to use context.octokit.checks.update, However, I found that there was no relevant content in the document, which made me very difficult to proceed to the next step. May I ask if there are better suggestions and more accurate documents to use Probot API
Thanks