docs(radio): fix typo in docs

[codebender828]

Fixes typo in documentation

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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[codebender828]

@all-contributors please add @kurotanshi for docs

[allcontributors]

@codebender828

I've put up a pull request to add @kurotanshi! 🎉