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

[Glenn Morris]

> The problem is that variable `comment-style' is not explained.

comment-style is a variable defined in `newcomment.el'.
Its value is indent

Documentation:
Style to be used for `comment-region'.
See `comment-styles' for a list of available styles.


comment-styles is a variable defined in `newcomment.el'.
[...]
((plain nil nil nil nil "Start in column 0 (do not indent), as in Emacs-20")
 (indent-or-triple nil nil nil multi-char "Start in column 0, but only  for 
single-char starters")
 (indent nil nil nil t "Full comment per line, ends not aligned")
 (aligned nil t nil t "Full comment per line, ends aligned")
 (box nil t t t "Full comment per line, ends aligned, + top and bottom")
 (extra-line t nil t t "One comment for all lines, end on a line by  itself")
 (multi-line t nil nil t "One comment for all lines, end on last commented 
line")
 (box-multi t t t t "One comment for all lines, + top and bottom"))