Add class ref to `UnboundMethod#owner` doc

It refers to `Method#receiver` in the doc, but
there's no class reference in current doc.
Some tools automatically make it a link so it's useful.

Closes: https://github.com/ruby/ruby/pull/2156

1 files changed, 1 insertions, 1 deletions

diff --git a/proc.c b/proc.c
index 2f990f65e4..5ac26be428 100644
--- a/proc.c
+++ b/proc.c
@@ -1647,7 +1647,7 @@ method_original_name(VALUE obj)
  *     meth.owner    -> class_or_module
  *
  *  Returns the class or module that defines the method.
- *  See also receiver.
+ *  See also Method#receiver.
  *
  *    (1..3).method(:map).owner #=> Enumerable
  */