improve karmada init help output
/kind cleanup
What this PR does / why we need it:
Which issue(s) this PR fixes: Fixes # improve karmada init help output
Special notes for your reviewer:
Does this PR introduce a user-facing change?:
Improve karmada init help output
/lgtm
I'm so sorry that I missed this PR on my radar. @my-git9 Could you please solve the conflicts? After that, you can assign it to me.
/assign @RainbowMango
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