Add yarddoc generation and fixup some errors

The `yard` rake task is now included by default.

And 2 small errors in the docs have been fixed.

Rakefile

@@ -64,4 +64,4 @@ task 'bundle:outdated' do
   sh("bundle outdated --only-explicit | tee #{bundle_outdated_report_pathname}")
 end
 
-task default: %i[spec features rubocop yardstick_measure bundle:audit license_finder]
+task default: %i[spec features rubocop yard yardstick_measure bundle:audit license_finder]

lib/sugar_utils/file/write_options.rb

@@ -4,7 +4,7 @@ module SugarUtils
   module File
     # @api private
     class WriteOptions
-      # @parma filename [String]
+      # @param filename [String]
       # @param options [Hash]
       def initialize(filename, options)
         @filename       = filename
@@ -47,7 +47,7 @@ def group
         @options[:group] || @existing_group
       end
 
-      # @param keys [Array]
+      # @param args [Array]
       # @return [Hash]
       def slice(*args)
         keys = args.flatten.compact