build: Fix distcheck
build: Fix distcheck

Dist-check in documentation failed due a line in wrong position.

MathieuDuponchelle/grilo-plugins,vrutkovs/grilo-plugins,MathieuDuponchelle/grilo-plugins,GNOME/grilo-plugins,MikePetullo/grilo-plugins,grilofw/grilo-plugins,kyoushuu/grilo-plugins,GNOME/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,MathieuDuponchelle/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,kyoushuu/grilo-plugins,MathieuDuponchelle/grilo-plugins,grilofw/grilo-plugins,kyoushuu/grilo-plugins,vrutkovs/grilo-plugins,jasuarez/grilo-plugins,jasuarez/grilo-plugins