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

[Lars Magne Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

> "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'.

`comment-styles' is defined in Emacs 24, at least, and has the list of
the 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.

`comment-region' links to it, which I think is sufficient for people to
discover it if they want to customize `comment-region'.

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