Changed the value that log_level takes to match the examples in the paragraph above

railties/guides/source/debugging_rails_applications.textile

@@ -127,7 +127,7 @@ When something is logged it's printed into the corresponding log if the log leve
 The available log levels are: +:debug+, +:info+, +:warn+, +:error+, and +:fatal+, corresponding to the log level numbers from 0 up to 4 respectively. To change the default log level, use
 
 <ruby>
-config.log_level = Logger::WARN # In any environment initializer, or
+config.log_level = :warn # In any environment initializer, or
 Rails.logger.level = 0 # at any time
 </ruby>