chore(deps-dev): bump ember-cli-addon-docs from 5.0.0 to 6.0.2

Bumps [ember-cli-addon-docs](https://github.com/ember-learn/ember-cli-addon-docs) from 5.0.0 to 6.0.2.
- [Release notes](https://github.com/ember-learn/ember-cli-addon-docs/releases)
- [Changelog](https://github.com/ember-learn/ember-cli-addon-docs/blob/master/CHANGELOG.md)
- [Commits](ember-learn/ember-cli-addon-docs@v5.0.0...v6.0.2)

---
updated-dependencies:
- dependency-name: ember-cli-addon-docs
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>