fix: Broken links to testgrid dashboard

[taptao]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Fixes a broken link to testgrid dashboard.

Which issue(s) this PR fixes:
This is related to an umbrella issue and fixes a task of the same:
kubernetes/test-infra#30370

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: taptao / name: Benjaminwei (f3b9143)

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[aojea]

/ok-to-test
/lgtm

/assign @swetharepakula

This is a doc update, check when is a good time to merge, I think you. mentioned something about some code freeze period but I can't remember the dates

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, taptao

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