Added docs URL for ansible_local provisioner

Vagrantfile

@@ -67,6 +67,7 @@ Vagrant.configure(2) do |config|
     # Provision by running Ansible from within the VM.
     # Vagrant will try to install Ansible automatically using pip
     # Advantage: Ansible doesn't have to be installed on the Vagrant host
+    # See also: https://www.vagrantup.com/docs/provisioning/ansible_local.html
     dev.vm.provision "ansible_local" do |ansible|
       #ansible.verbose = "vvv"
       ansible.compatibility_mode = "2.0"