Yank the message that's being replied to into the message buffer
(@code{message-yank-original}).
-@item C-c M-C-y
-@kindex C-c M-C-y
+@item C-c C-M-y
+@kindex C-c C-M-y
@findex message-yank-buffer
Prompt for a buffer name and yank the contents of that buffer into the
message buffer (@code{message-yank-buffer}).