* proc.c (rb_mod_define_method): doc fix

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25045 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

proc.c

@@ -1288,7 +1288,7 @@ rb_mod_define_method(int argc, VALUE *argv, VALUE mod)
  *     define_singleton_method(symbol) { block } => proc
  *
  *  Defines a singleton method in the receiver. The _method_
- *  parameter can be a +Proc+ or +Method+ object.
+ *  parameter can be a +Proc+, a +Method+ or an +UnboundMethod+ object.
  *  If a block is specified, it is used as the method body. 
  *
  *     class A