docs: virt: convert UML documentation to ReST

Despite being an old document, it contains lots of information
that could still be useful.

The document has a nice style with makes easy to convert to
ReST. So, let's convert it to ReST.

This patch does:

	- Use proper markups for titles;
	- Mark and proper indent literal blocks;
	- don't use an 'o' character for lists;
	- other minor changes required for the doc to be parsed.

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

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