docs/man: extract documentation of PCI_SPEC_STRING from the xl.cfg manpage...
... and put it into a new xl-pci-configuration(5) manpage, akin to the
xl-network-configration(5) and xl-disk-configuration(5) manpages.
This patch moves the content of the section verbatim. A subsequent patch
will improve the documentation, once it is in its new location.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Acked-by: Wei Liu <wl@xen.org>