bug#14964: 24.3.50; doc of `compare-window-configurations'

[Drew Adams]

The doc doesn't tell you enough about what this function does to be able
to use it.  Compare how?  What does a non-nil or nil return value mean?
Does the order of the two arguments matter?  What's going on here?  What
for?

In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
 of 2013-07-21 on ODIEONE
Bzr revision: 113485 lekktu@gmail.com-20130722012547-e3b7qxn1dba5vf20
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/Devel/emacs/binary --enable-checking=yes,glyphs
 CFLAGS=-O0 -g3 LDFLAGS=-Lc:/Devel/emacs/lib
 CPPFLAGS=-Ic:/Devel/emacs/include'