Bump ember-cli-addon-docs from 0.6.14 to 0.6.15
Bump ember-cli-addon-docs from 0.6.14 to 0.6.15

Bumps [ember-cli-addon-docs](https://github.com/ember-learn/ember-cli-addon-docs) from 0.6.14 to 0.6.15.
- [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](https://github.com/ember-learn/ember-cli-addon-docs/compare/v0.6.14...v0.6.15)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rwwagner90/ember-shepherd,shipshapecode/ember-shepherd,shipshapecode/ember-shepherd,rwwagner90/ember-shepherd