bug#3598: 23.0.94; doc string of frame-root-window

[Drew Adams]

Doc string:
Returns the root-window of frame.
 
1. "root-window" should be "root window".
 
2. Root window needs to be explained - what is it?
 
With no explanation, this doc string says nothing at all:
"`frame-root-window' returns the frame's root window". Gee thanks a
lot! `thrinblat-oag-plaz' returns the thrinblat's oag plaz.
 
3. And the manual's don't help - `frame-root-window' is not mentioned.
 

In GNU Emacs 23.0.94.1 (i386-mingw-nt5.1.2600)
 of 2009-05-24 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'