fix: update Release Notes Handbook link to correct URL

[nmn3m]

What this PR does / why we need it:
This PR updates the "Release Notes Handbook" link in contributors/guide/release-notes.md to point to the correct location of the handbook on GitHub.
The previous link was broken and resulted in a 404 error.

Which issue(s) this PR fixes:
Fixes #8509

Special notes for your reviewer:

• No other content was changed.
• The new link is: https://github.com/kubernetes/sig-release/blob/master/release-engineering/release-notes.md

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[k8s-ci-robot]

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[Priyankasaggu11929]

Thank you for the PR, @nmn3m. :)

I've left inline comments requesting changes.

[Priyankasaggu11929]

This change is not needed.

Suggested change

	For more tips on writing good release notes, check out the [Release Notes Handbook](https://github.com/kubernetes/sig-release/blob/master/release-engineering/release-notes.md).
	For more tips on writing good release notes, check out the [Release Notes Handbook].

[Priyankasaggu11929]

Please remove this change as well. Not needed.

Also, squash the commit to one.

/ok-to-test

[Priyankasaggu11929]

Please remove this change as well. Not needed.

Also, squash the commit to one.

/ok-to-test

[Priyankasaggu11929]

/lgtm
/approve

Thank you!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nmn3m, Priyankasaggu11929

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Needs approval from an approver in each of these files:

• contributors/guide/OWNERS [Priyankasaggu11929]

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