/usr/share/doc/ is in xl2tpd 1.3.1+dfsg-1.
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/usr/share/doc/xl2tpd/
/usr/share/doc/xl2tpd/examples/
/usr/share/doc/xl2tpd/examples/xl2tpd-L2TP-CERT-orgWIN2KXP.conf
/usr/share/doc/xl2tpd/examples/xl2tpd-L2TP-CERT.conf
/usr/share/doc/xl2tpd/examples/xl2tpd.conf
/usr/share/doc/xl2tpd/examples/chapsecrets.sample
/usr/share/doc/xl2tpd/examples/xl2tpd-L2TP-PSK.conf
/usr/share/doc/xl2tpd/examples/ppp-options.xl2tpd
/usr/share/doc/xl2tpd/examples/README
/usr/share/doc/xl2tpd/examples/xl2tpd-L2TP-PSK-orgWIN2KXP.conf
/usr/share/doc/xl2tpd/CREDITS
/usr/share/doc/xl2tpd/pppol2tp-2.6.23.README
/usr/share/doc/xl2tpd/copyright
/usr/share/doc/xl2tpd/changelog.Debian.gz
/usr/share/doc/xl2tpd/pfc.README
/usr/share/doc/xl2tpd/README.xl2tpd