bug#10868: 24.0.93; `comment-style' needs to be explained

[Drew Adams]

This is a followup to bug #3370, which was closed without attention to
the bug thread.  The problem is that variable `comment-style' is not
explained.  Please do so.
 
See this message from the bug #3370 thread, as well as other parts of
the thread, for a discussion of the problem:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3370#88


In GNU Emacs 24.0.93.1 (i386-mingw-nt5.1.2600)
 of 2012-02-15 on MARVIN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.6) --no-opt --enable-checking --cflags
 -ID:/devel/emacs/libs/libXpm-3.5.8/include
 -ID:/devel/emacs/libs/libXpm-3.5.8/src
 -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
 -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
 -ID:/devel/emacs/libs/giflib-4.1.4-1/include
 -ID:/devel/emacs/libs/jpeg-6b-4/include
 -ID:/devel/emacs/libs/tiff-3.8.2-1/include
 -ID:/devel/emacs/libs/gnutls-3.0.9/include'