doc string of minibuffer-message should mention minibuffer-message-timeout, not "2 sec"

[Drew Adams]

C-h f minibuffer-message ->
Temporarily display string at the end of the minibuffer.
The text is displayed for two seconds,
or until the next input event arrives, whichever comes first.

C-h v minibuffer-message-timeout ->
How long to display an echo-area message when the minibuffer is active.
If the value is not a number, such messages don't time out.

"Two seconds" should not be hard-coded in the doc string for
minibuffer-message.

In GNU Emacs 22.0.50.1 (i386-mingw-nt5.1.2600)
 of 2005-06-26 on NONIQPC
X server distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc
(3.3) --cflags -I../../jpeg-6b-3/include -I../../libpng-1.2.8/include -I../.
./tiff-3.6.1-2/include -I../../xpm-nox-4.2.0/include -I../../zlib-1.2.2/incl
ude'