fix: sources table rendering

[prushh]

Fixes #6139

Proposed Changes

• add missing table delimiters (pipes)
• update RedisSource url with knative-extensions/eventing-redis repository url

[knative-prow]

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[prushh]

Should I bump the RedisSource status to "Beta"?
Ref: https://github.com/knative-extensions/eventing-redis?tab=readme-ov-file#redis-components-for-knative

Edit: Also let me know if I can fix the unit tests in this PR, I think it is only necessary to change the version of express in the Recreating the sample code section of this README.md