/usr/share/doc/puppet-module-puppetlabs-apt/examples/ppa.pp is in puppet-module-puppetlabs-apt 2.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | class { 'apt': }
# Example declaration of an Apt PPA
apt::ppa{ 'ppa:openstack-ppa/bleeding-edge': }
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