Feedback `title`, `altTitle` instructions and schema

[danielghost]

Subject of the issue/enhancement/features

Since #223, if the feedback title is empty, it no longer uses the component title as a fallback. The altTitle added in #201 is not included in the schemas or README.

The schemas, example.json and README need updating accordingly.

[cahirodoherty-learningpool]

Possibly fixed by #288

[github-actions]

🎉 This issue has been resolved in version 6.25.8 🎉

The release is available on GitHub release

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