Fix Invalid Release-Notes Handbook Link

[bupd]

What type of PR is this:

/kind documentation
/kind bug
/area release-team

What this PR does / why we need it:

Removes Invalid Hanbook link from Release-Team README.md

Which issue(s) this PR fixes:

• Fixes Invalid Link Release Notes Handbook #2786

Special notes for your reviewer:

This PR is just a simple single line removal

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bupd, jenshu
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