(docs) Add 2.2.1 release notes.
(docs) Add 2.2.1 release notes.

puppetlabs/puppet-server,puppetlabs/puppetserver,waynr/puppet-server,erikPrime/puppetserver,camlow325/puppetserver,erikPrime/puppet-server,briancain/puppet-server,cprice404/puppet-server,waynr/puppet-server,waynr/puppetserver,rlinehan/puppetserver,shrug/puppet-server,camlow325/puppet-server,puppetlabs/puppet-server,erikPrime/puppet-server,er0ck/puppetserver,erikPrime/puppetserver,cprice404/puppetserver,shrug/puppet-server,cprice404/puppetserver,rlinehan/puppetserver,waynr/puppetserver,rlinehan/puppetserver,puppetlabs/puppetserver,briancain/puppet-server,puppetlabs/puppet-server,cprice404/puppet-server,rlinehan/puppetserver,shrug/puppet-server,puppetlabs/puppetserver,waynr/puppetserver,er0ck/puppetserver,camlow325/puppet-server,waynr/puppet-server,camlow325/puppet-server,erikPrime/puppetserver,rlinehan/puppet-server,er0ck/puppetserver,briancain/puppet-server,camlow325/puppetserver,rlinehan/puppet-server,cprice404/puppet-server,cprice404/puppetserver,puppetlabs/puppetserver,shrug/puppet-server,er0ck/puppetserver,camlow325/puppetserver,erikPrime/puppet-server,camlow325/puppetserver,rlinehan/puppet-server