bug#20724: 25.0.50; doc string of option `custom-buffer-style' is incorrect

[Lars Ingebrigtsen]

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

> This part is not up-to-date:
>
>   The value should be a symbol, one of:
>
>   brackets: groups nest within each other with big horizontal brackets.
>   links: groups have links to subgroups.
>
> The value can be several other symbols, besides those two.

The only useful value I could find was `tree', which I have now added.
The code mentioned `face' somewhere, but it didn't look very useful.

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   bloggy blog: http://lars.ingebrigtsen.no