bug#3155: 23.0.92; doc string of assoc-default

Doc string:
 
 Find object KEY in a pseudo-alist ALIST.
 ALIST is a list of conses or objects.  Each element (or the element's car,
 if it is a cons) is compared with key by evaluating (TEST (car elt) KEY).
 If that is non-nil, the element matches;
 then `assoc-default' returns the element's cdr, if it is a cons,
 or DEFAULT if the element is not a cons.
 
 If no element matches, the value is nil.
 If TEST is omitted or nil, `equal' is used.
 
This part is incorrect when the element is not a cons: "by evaluating
(TEST (car elt) KEY)" (not to mention the fact that "elt" is
undefined/unexplained).  It should say something like "by calling TEST
on KEY and the element (or the element's car, if it is a cons)."
 
(The Elisp manual explanation is correct.)
 

In GNU Emacs 23.0.92.1 (i386-mingw-nt5.1.2600)
 of 2009-03-30 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'