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.
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.