[cairo] [PATCHES] documentation update

[Nis Martensen]

Please review the attached patches. Most of them simply improve the
documentation. In a few cases you may want to check whether the new
documentation is actually correct.

One of the patches (ensure compatibility spelling) also
adapts code, not sure if this is ok.

doc/public/cairo-sections.txt still wants an update. I'm not sure
about the correct sections for the "unused" symbols. Who takes care
of that?

Regards,
 Nis
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