✨ (cli): enhance help information for kubebuilder alpha generate command

[camilamacedo86]

Clarify better usage and information.

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[camilamacedo86]

/test pull-kubebuilder-e2e-k8s-1-33-0

[camilamacedo86]

I think it is essential we ensure the info is properly.
Anyway, if anyone would like to contribute and improve the wording, please feel free.
Just raise a PR with the info. However, since it is also tiny and we have no objections so far, I am moving forward to allow us to receive further assistance with reviewing the PRs that we most need, as the current review has been limited.