doc: Let everyone know about the new vagrant lxc sudoers command

README.md

@@ -128,9 +128,12 @@ end
 ### Avoiding `sudo` passwords
 
 This plugin requires **a lot** of `sudo`ing since [user namespaces](https://wiki.ubuntu.com/UserNamespace)
-are not supported on mainstream kernels. Have a look at the [Wiki](https://github.com/fgrehm/vagrant-lxc/wiki/Avoiding-'sudo'-passwords)
-to find out how to work around that specially if you are running an OS with `sudo`
-< 1.8.4 (like Ubuntu 12.04) as you might be affected by a bug.
+are not supported on mainstream kernels. To work around that, you can use the
+`vagrant lxc sudoers` command which will create a file under `/etc/sudoers.d/vagrant-lxc-<USER>`
+whitelisting all commands required by `vagrant-lxc` to run.
+
+If you are interested on what will be generated by that command, please check
+[this code](lib/vagrant-lxc/commands/sudoers.rb#L58-L81).
 
 ### Base boxes
 

lib/vagrant-lxc/command/root.rb

@@ -3,7 +3,7 @@ module Vagrant
     module Command
       class Root < Vagrant.plugin("2", :command)
         def self.synopsis
-          'LXC setup'
+          'vagrant-lxc specific commands'
         end
 
         def initialize(argv, env)

lib/vagrant-lxc/command/sudoers.rb

@@ -4,7 +4,6 @@ module Vagrant
   module LXC
     module Command
       class Sudoers < Vagrant.plugin("2", :command)
-
         def execute
           options = { user: ENV['USER'] }