Document the `addChannel` step defined in https://github.com/semantic-release/semantic-release/blob/e35e5bb73f3628906553709ac0f5beb8f565c61a/lib/definitions/plugins.js#L83-L84, which is used in @semantic-release/npm.
semantic-release documentation
- Usage - semantic-release installation and configuration
- Extending- Extending semantic-release with plugins and shareable configurations
- Recipes - Community written recipes for common semantic-release use-cases
- Developer Guide - The essentials of writing a semantic-release plugin or shareable configurations
- Support - FAQ and troubleshooting