[PATCH] gdb: improve usage strings

[Mike Frysinger]

On Saturday 11 August 2012 13:52:24 Eli Zaretskii wrote:
> From: Mike Frysinger <vapier@gentoo.org>
> > so it seems like finish *does* secretly accept options, but in this case
> > it's trying to be secret about it rather than someone just didn't fully
> > document it.  or i read the "arg" parsing logic above incorrectly.
> 
> Isn't that the case of "finish &" ?

i'm not familiar with async behavior in gdb.  is it something that applies to 
all commands, or just to a select few ?  if the latter, should we still 
document it in the usage string ?
	Usage: finish [&]
if the former, seems weird that every command would parse it itself ...
-mike
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