Fix Markdown syntax of Non proxy hosts and Proxy host

[Dohbedoh]

Recently discovered that wildcard syntax including several * are mis-interpreted by Markdown parsers.. For example 10.1.*.* would be 10.1.. with a bold dot..

Testing done

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[Dohbedoh]

Or maybe we should just fix this entire content. The markdown is borked in the file and Proxy configuration does not make sense in an update-center.md anymore (if it ever did)..

[jglick]

Good so far as it goes. Other changes could be follow-ups?

[PierreBtz]

Or maybe we should just fix this entire content.

As far as changing things in depth, we could contemplate using a more machine friendly language :)