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

[Drew Adams]

> I like preloading newcomment.el.  It's a package that is very 
> likely to be used in most Emacs sessions, and it has a whole
> bunch of autoload cookies in it (and prior to introducing
> newcomment.el, the corresponding functionality was preloaded
> since it was in simple.el).

Sounds good to me.  And it's good to know those (3 strong) reasons, for future
contexts.