/usr/share/gtk-doc/html/ is in at-spi-doc 1.32.0-1ubuntu1.
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/usr/share/gtk-doc/html/at-spi-cspi/
/usr/share/gtk-doc/html/at-spi-cspi/at-spi-cspi-Accessible-Objects.html
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/usr/share/gtk-doc/html/at-spi-cspi/at-spi-cspi-AccessibleApplication-API.html
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/usr/share/gtk-doc/html/at-spi-cspi/up.png