(Docs) Fix broken links to Puppet 3 and 4
(Docs) Fix broken links to Puppet 3 and 4

This fixes some broken links in older versions of the docs that
deal with Puppet 3 agent compatibility. In some cases this means
linking to the docs archive for docs that no longer exist in their
original form on the website.

puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server