bug#247: docstring only mention one binding when there are two

[jidanni]

Exhibit A:
kill-region is an interactive compiled Lisp function in `simple.el'...
(If you want to kill and then yank immediately, use <C-insertchar>.)

Exhibit B:
<C-insert> runs the command kill-ring-save
  which is an interactive compiled Lisp function in `simple.el'.
It is bound to <C-insertchar>, <C-insert>.

Trying to guess what key is C-insertchar, I stumbled upon C-insert,
which showed that Exhibit A does not mention both keys.
(To this day I don't know which of my 104 keys is "insertchar".)

By the way, don't say
"If you want to kill and then yank immediately"
say
"If you want to save the region as if killed, but don't kill it"
as it sounds less nuts :-)

emacs-version "22.2.1"