RDoc from Hugh Sasse [ruby-core:8012]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10336 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/drb/drb.rb

@@ -430,12 +430,15 @@ module DRb
     end
   end
 
+  # An exception wrapping an error object
   class DRbRemoteError < DRbError
     def initialize(error)
       @reason = error.class.to_s
       super("#{error.message} (#{error.class})")
       set_backtrace(error.backtrace)
     end
+
+    # the class of the error, as a string.
     attr_reader :reason
   end