fix: a typo in yurtctl util.go which uses 'lable' as 'label'

[donychen1134]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

fix a typo in yurtctl util.go which uses 'lable' as 'label'.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

fix a typo in yurtctl util.go which uses 'lable' as 'label'.

other Note

[openyurt-bot]

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In response to this:

What type of PR is this?

/kind documentation

What this PR does / why we need it:

fix a typo in yurtctl util.go which uses 'lable' as 'label'.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

fix a typo in yurtctl util.go which uses 'lable' as 'label'.

other Note

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[openyurt-bot]

Welcome @donychen1134! It looks like this is your first PR to openyurtio/openyurt 🎉

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: donychen1134, rambohe-ch

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[Congrool]

/lgtm
Thanks.