build(deps): bump octokit from 4.21.0 to 4.22.0 in /docs

Bumps [octokit](https://github.com/octokit/octokit.rb) from 4.21.0 to 4.22.0.
- [Release notes](https://github.com/octokit/octokit.rb/releases)
- [Changelog](https://github.com/octokit/octokit.rb/blob/4-stable/RELEASE.md)
- [Commits](https://github.com/octokit/octokit.rb/compare/v4.21.0...v4.22.0)

---
updated-dependencies:
- dependency-name: octokit
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>