installation docs: fix table syntax for repos

[andresailer]

• fix table syntax for repos
• remove stray quote marks

The dependency table is there now, but the other two tables are gone.

[esindril]

Thanks and sorry of that, the display should be fixed now!

[andresailer]

Thanks! There is still that CentOS9 Stream vs Fedora 38, but everything is visible now in the docs at least :+1:

[esindril]

Eventual consistency ensured! Fixed also the reference to Fedora 38. Thanks!