Bump @storybook/addon-docs from 8.0.8 to 8.1.5

Bumps [@storybook/addon-docs](https://github.com/storybookjs/storybook/tree/HEAD/code/addons/docs) from 8.0.8 to 8.1.5.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v8.1.5/code/addons/docs)

---
updated-dependencies:
- dependency-name: "@storybook/addon-docs"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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