bug#3371: 23.0.94; doc of `comment-style'

[Drew Adams]

Doc string:
 
"Style to be used for `comment-region'.
See `comment-styles' for a list of available styles."
 
1. Put the available styles here.
 
2. There is no such function or variable as `comment-styles'.
 
3. `comment-style' is mentioned in neither the Emacs manual nor the
Elisp manual.
 
IOW, there is really no doc explaining what this is, what it does, or
how it does it.
 
 
 
In GNU Emacs 23.0.94.1 (i386-mingw-nt5.1.2600)
 of 2009-05-24 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'