bug#8353: 24.0.50; Header of *Apropos* buffer needs to explain `(SCORE)'

[Drew Adams]

(setq apropos-sort-by-scores 'verbose)
 
C-h a forward buffer char RET
 
The buffer header needs to explain what the parenthesized numbers mean,
e.g. (804).  First, explain that these are scores.  Second, explain what
they mean and how hits are scored.
 
It makes no sense to introduce a new feature like this without
describing it to users.

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2011-03-21 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.5) --no-opt --cflags
-Ic:/imagesupport/include'