(SERVER-1661) Removed `compat-version` reference from the config docs
(SERVER-1661) Removed `compat-version` reference from the config docs

This commit removes information for the `compat-version` setting, which
is no longer valid, from the config_file_puppetserver.markdown doc.

camlow325/puppet-server,er0ck/puppetserver,er0ck/puppetserver,camlow325/puppetserver,camlow325/puppetserver,puppetlabs/puppet-server,rlinehan/puppet-server,er0ck/puppetserver,rlinehan/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppet-server,rlinehan/puppetserver,rlinehan/puppetserver,er0ck/puppetserver,camlow325/puppet-server,puppetlabs/puppetserver,camlow325/puppetserver,camlow325/puppet-server,camlow325/puppetserver,puppetlabs/puppetserver,rlinehan/puppet-server,rlinehan/puppet-server,puppetlabs/puppetserver,rlinehan/puppetserver