Add documentation entry for init command --template flag

plugins/commands/init/command.rb

@@ -40,7 +40,7 @@ module VagrantPlugins
             options[:output] = output
           end
 
-          o.on("--template FILE", String, "Path to Vagrantfile template") do |template|
+          o.on("--template FILE", String, "Path to custom Vagrantfile template") do |template|
             options[:template] = template
           end
         end

website/source/docs/cli/init.html.md

@@ -36,6 +36,8 @@ setting in the created Vagrantfile.
 * `--output FILE` - This will output the Vagrantfile to the given file.
   If this is "-", the Vagrantfile will be sent to stdout.
 
+* `--template FILE` - Provide a custom ERB template for generating the Vagrantfile.
+
 ## Examples
 
 Create a base Vagrantfile: