When we execute the command gh repo create --help shows just a description about the public option. Who uses GitHub knows that is possible to use a private repository, but I believe that it can be more specific on help command as well.

Proposed solution

I suggest using simple information on help command like (default: private) that it can be clean for users to understand that the repository will be created as private.

Additional context

--public Make the new repository public (default: private)

Instead:
--public Make the new repository public

Thank you for helping the GitHub CLI as possible as well.