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

[Glenn Morris]

Lawrence Mitchell wrote:

> The docstring of comment-style refers the user to comment-styles for
> details on what the values mean.  However, this is not available until
> after newcomment.el is loaded.  So autoload comment-styles to avoid
> this problem.

Then this is an instance of a general problem. See eg
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=1768
for the same thing.

IMO there should be a general solution rather than papering over every
instance that occurs with more pre/autoloading.