Mark some new Sass::Script classes as :nodoc:.

lib/sass/script/funcall.rb

@@ -1,6 +1,6 @@
 module Sass
   module Script
-    class Funcall
+    class Funcall # :nodoc:
       attr_reader :name, :args
 
       def initialize(name, args)

lib/sass/script/lexer.rb

@@ -2,7 +2,7 @@ require 'strscan'
 
 module Sass
   module Script
-    class Lexer
+    class Lexer # :nodoc:
       OPERATORS = {
         '+' => :plus,
         '-' => :minus,

lib/sass/script/parser.rb

@@ -2,7 +2,7 @@ require 'sass/script/lexer'
 
 module Sass
   module Script
-    class Parser
+    class Parser # :nodoc:
       def initialize(str, environment = {})
         @lexer = Lexer.new(str)
         @environment = environment