Small fix about doc file

[lijin-union]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
small fix:

• corrected a link
• remove a useless parenthesis in the _sidebar file

Does this PR introduce a user-facing change?:

Fix sidebar documentation

[k8s-ci-robot]

Hi @lijin-union. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[MrFreezeex]

Thanks, good catch :D
/ok-to-test
/lgtm

[yankay]

Thanks @lijin-union
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lijin-union, MrFreezeex, yankay

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