Fix reference formatting in KAK demo

[dwierichs]

I used nested formatting in reference links in #1372.
ReST does not support this.
Here we remove the nested formatting (and adjust two small wordings that struck me as suboptimal upon re-reading)

[github-actions]

👋 Hey, looks like you've updated some demos!

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[github-actions]

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• Pull Request ID: 1395
• Deployment SHA: 642a1fc28726cadbc194af68f63129b1439dc70e
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[Qottmann]

to be consistent, we should also add links to the other journal papers

the second reference to QSD I think it would be more consistent to have the whole journal reference as the link, not just Vol and No

In other demos we often link arxiv as arXiv:1234.1234 which I personaly prefer and think looks cleaner than writing "arXiv preprint" before each identifier-link

[Qottmann]

Sorry to be a nuisance 😅 just looked at it and found the full stops a bit awkward. Looking through some demos, I dont think there is a gold standard, so leaving the suggestion (to be applied for all) as optional