/usr/share/doc/ is in libsparkline-php 0.2-6.
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..
/usr/share/doc/libsparkline-php/
/usr/share/doc/libsparkline-php/DESIGN
/usr/share/doc/libsparkline-php/README
/usr/share/doc/libsparkline-php/changelog.Debian.gz
/usr/share/doc/libsparkline-php/copyright
/usr/share/doc/libsparkline-php/examples/
/usr/share/doc/libsparkline-php/examples/baseball.php
/usr/share/doc/libsparkline-php/examples/deficit.php
/usr/share/doc/libsparkline-php/examples/filled.php
/usr/share/doc/libsparkline-php/examples/primitives.php
/usr/share/doc/libsparkline-php/examples/stock_chart.php
/usr/share/doc/libsparkline-php/examples/stock_chart2.php
/usr/share/doc/libsparkline-php/examples/stock_chart3.php