docs(development): fix ProbotOctokit usage example

[chris-schra]

The currently documented example

function myProbotApp(app) {
  const octokit = new ProbotOctokit({
    // any options you'd pass to Octokit
    auth: "token <myToken>",
    // and a logger
    log: app.log.child({ name: "my-octokit" }),
  });
}

does not work. It will return an error because of missing auth.

This PR modifies the example to show the currently supported way for token auth

---

View rendered docs/development.md

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[gr2m]

Confirmed, thank you!

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Thanks for your contribution to probot! 🎉

[github-actions]

🎉 This PR is included in version 12.2.1 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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