bug#3042: 23.0.92; display-visual class doc

[Lars Magne Ingebrigtsen <larsi@gnus.org>]

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

> The doc does not explain what the possible values mean. There are no
> other occurrences of the various values (e.g. `static-color') in the
> Elisp manual or other doc strings (that I can find) than what is said
> about `display-visual-class'.

I've now changed the section to this:

@defun display-visual-class &optional display
This function returns the visual class for the screen.  The value is
one of the symbols @code{static-gray} (a limited, unchangeable number
of grays), @code{gray-scale} (a full range of grays),
@code{static-color} (a limited, unchangeable number of colors),
@code{pseudo-color} (a limited number of colors), @code{true-color} (a
full range of colors), and @code{direct-color} (a full range of
colors).
@end defun

I think that's probably somewhat correct, although I'm not sure what
`pseudo-color' really is.  Anybody?

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