Fix docbook 4.5 vs 5 usage [ci skip]

Recent changes introduced the use of the Docbook 5 syntax for external
links (<link xlink:href="https://www.example.com"/>), which works okay
for the doc build, but breaks the internal tools which do formal validation
against the scons-modified docbook DTD ("sconsdoc") because sconsdoc is
a modification of Docbook 4.5 thus pinning us to that version.
xlink was a Docbook 5 introduction to use more standard W3C syntax
for the links (xlink is a W3C spec of its own).

Back off this new usage: go back to the old usage pattern
(<ulink url="https://www.example.com">), because trying to uplift
sconsdoc looks a fairly substantial task.

Signed-off-by: Mats Wichmann <mats@linux.com>

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