docs: update topology.example.yaml

[ichn-hu]

What problem does this PR solve?

the original link is 404

What is changed and how it works?

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Tests

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[CLAassistant]

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[ti-chi-bot]

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[AstroProfundis]

@ichn-hu Thank you for the contribution, please sign the CLA so that we can merge your PR.

[ichn-hu]

@ichn-hu Thank you for the contribution, please sign the CLA so that we can merge your PR.

signed

[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 9fbad2d