I noticed that the TUI-related sections of the GDB docs are a little rough.  I'm 
no expert on this feature, but I thought I'd have a go at cleaning up the docs 
anyway.  I discovered a few minor discrepancies between the current behavior and 
the document, along with numerous issues of style, formatting and grammar. 
Here's what I came up with.  Is it OK?

2007-05-09  Bob Wilson  <bob.wilson@acm.org>
	
	* all-cfg.texi (GDBTUI): New.
	* gdb.texinfo (Mode Options): Use GDBTUI variable.
	(TUI, TUI Overview, TUI Keys, TUI Single Key Mode, TUI Commands)
	(TUI Configuration): Edit to improve clarity and fix problems of
	both style and content.