Types of quotes in xref linkend references

Whilst looking to track down some package references within
the XML sources, I happened to notice, in

x/installing/xorg-config.xml

that it has some xref elements in which the linkend attributes
have targets enclosed in single quotes, rather than the double
quotes I had seen elsewhere, and, as it happened, happened to
be grep-ing for when I couldn't find something!

I appreciate that there's no LFS style guide, and that one can
use either form, but "the numbers"

$ grep -r linkend=\" . | wc -l
9202
$
$ grep -r linkend=\' . | wc -l
330
$

might suggest that double quotes should be used for attribute
values, unless there's any specific reason why single quotes
are needed.

Then again, maybe such inconsistencies in the sources are part
of the learning experience.

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