Bump yargs-parser from 9.0.2 to 18.1.3 in /userguide

Bumps [yargs-parser](https://github.com/yargs/yargs-parser) from 9.0.2 to 18.1.3.
- [Release notes](https://github.com/yargs/yargs-parser/releases)
- [Changelog](https://github.com/yargs/yargs-parser/blob/master/CHANGELOG.md)
- [Commits](yargs/yargs-parser@v9.0.2...v18.1.3)

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