Bug#927193: Broken pppoe documentation link

[積丹尼 Dan Jacobson]

Package: ppp
Version: 2.4.7-2+4.1
Severity: minor
File: /usr/share/doc/ppp/README.pppoe

Change
http://www.roaringpenguin.com/pppoe to
https://dianne.skoll.ca/projects/rp-pppoe/