Documentation housekeeping

This commit comprises minor documentation updates as flagged by Puppet
Strings. This includes:

- Moving the Japanese README to the root of the project (YARD does not
  know how to parse a readmes directory).
- Update class documentation to include the name of the parameter.
- Add a minimal description to the Augeas provider.

Author: mhashizume

readmes/README_ja_JP.md renamed to README_ja_JP.md

@@ -21,6 +21,8 @@
 require_relative '../../../puppet_x/augeas/util/parser'
 
 Puppet::Type.type(:augeas).provide(:augeas) do
+  desc 'The Augeas provider'
+
   include Puppet::Util
   include Puppet::Util::Diff
   include Puppet::Util::Package

lib/puppet/provider/augeas/augeas.rb

@@ -30,7 +30,7 @@ module PuppetX::Augeas::Util::Parser
   # support the full quite of escape sequences that Ruby allows in
   # double-quoted strings.
   #
-  # @param [String] The string to be parsed.
+  # @param string [String] The string to be parsed.
   # @return [Array<String>] The parsed array elements, including handling any
   #   escape sequences.
   def parse_to_array(string)