Rectangles are not explained or cross-referenced in Elisp manual

[Drew Adams]

The Elisp manual says nothing about rectangles. It mentions them in
passing in a few places, with no explanation. Those places should at
least contain a cross-reference to the Rectangles node of the Emacs
manual. 

Also, there are two places where the text says "a 'frame' is a
rectangle". This promotes confusion. It would be better to say "a
'frame' is a rectangular area of your screen" or, better, "a 'frame'
is a window-manager window". The latter is by far the most helpful
description.


In GNU Emacs 22.0.50.1 (i386-mingw-nt5.1.2600)
 of 2006-03-20 on W2ONE
X server distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --cflags -Id:/g/include'