Finding the correct link to a XML description or API reference section
in a big blob of links concatenated in a paragraph is unpleasand and
especially for 'capabilities' and 'domain capabilities' following each
other.

Turn the API and XML reference sections into a list in RST and add CSS
to fromat it a bit more compact.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>