Document the way BufferedLogger defines its methods.

activesupport/lib/active_support/buffered_logger.rb

@@ -68,6 +68,10 @@ module ActiveSupport
       message
     end
 
+    # Dynamically add methods such as:
+    # def info
+    # def warn
+    # def debug
     for severity in Severity.constants
       class_eval <<-EOT, __FILE__, __LINE__ + 1
         def #{severity.downcase}(message = nil, progname = nil, &block) # def debug(message = nil, progname = nil, &block)