guides/source/initialization.md in rails-4.2.2 vs guides/source/initialization.md in rails-4.2.3.rc1

@@ -159,10 +159,10 @@
 When one types an incorrect rails command, the `run_command` is responsible for
 throwing an error message. If the command is valid, a method of the same name
 is called.
 
 ```ruby
-COMMAND_WHITELIST = %(plugin generate destroy console server dbconsole application runner new version help)
+COMMAND_WHITELIST = %w(plugin generate destroy console server dbconsole application runner new version help)
 
 def run_command!(command)
   command = parse_command(command)
   if COMMAND_WHITELIST.include?(command)
     send(command)