fix typos of dns resolver proposal

[YaoZengzeng]

What type of PR is this?

What this PR does / why we need it:

typo fix

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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see 6 files with indirect coverage changes

[kmesh-bot]

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This pull-request has been approved by: hzxuzhonghu

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