doc/lispref/frames.texi (Multiple Terminals): Improve the description of X
display names. Add index entries.
(Basic Parameters): Add a cross-reference to where X display names
are described.
(Position Parameters): Mention that positional parameters of the
form (+ POS) can be negative if they are on a non-primary monitor
of a multi-monitor display.
(Creating Frames): Mention that on multi-monitor displays the
frame might be positioned differently than specified by the frame
parameters alist.
lisp/faces.el (display-grayscale-p): Mention in the doc string that
the argument can be either a display name or a frame.
lisp/frame.el (display-pixel-height, display-pixel-width)
(display-mm-height, display-mm-width, display-backing-store)
(display-save-under, display-planes, display-color-cells)
(display-visual-class, display-monitor-attributes-list)
(display-screens): Mention in the doc string that the argument can
be either a display name or a frame. Improve the docs of the
monitor attributes.
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