[virt-manager]: restore usage examples

originally, the libre.patch simply deleted the documentation usage examples;
  because they referred to non-FSDG-fit distros;
  and the 'osinfo-db' package has no definitions for FSDG-fit distros
this commit adds back the usage examples, referring to FSDG distros instead
the exact usage examples given will not work, without also adding
  the 'parabola' definition to the osinfo database
the documentation is complete however; so that is already an improvement
we could fork the 'osinfo-db' package, to add the parabola definition;
  but experimentation suggests that it can be accomplished
  via the 'libosinfo' package, which parabola already patches
ideally, we should request that parabola be added to the osinfo-db upstream
  (which is probably a good idea anyways)

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