[mailnike]

Several documentation links return HTTP 404. This updates each to its current working location:

• docs/versioned/eventing/event-registry/eventmesh-backstage-plugin.md (1 link)
• docs/versioned/eventing/sinks/README.md (1 link)
• docs/versioned/bookstore/page-7/slack-sink-learning-knative-eventing-and-apache-camel-K-integration.md (5 links)

Docs-only change. Each replacement URL was verified to return HTTP 200.

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mailnike
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[knative-prow]

Welcome @mailnike! It looks like this is your first PR to knative/docs 🎉

[github-actions]

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