Fix cp02 typo && add note

[zouyingjie]

Changes

• fix typo, kubect to kubectl.
• Add a disk requirement note for Docker Desktop running on MacOS

/kind

Fixes #

Release Note

Docs

[salaboy]

@zouyingjie I've added a small comment and request for change.. let me know if that makes sense.

[salaboy]

@zouyingjie thanks a lot!