invoke.texi: Fix minor typos

[Gerald Pfeifer]

On Mon, 21 Mar 2011, Nick Clifton wrote:
> 2011-03-21  Nick Clifton  <nickc@redhat.com>
> 
> 	* doc/invoke.texi (Overall Options): Move closing brace to end of
> 	options list.
> 	(Optimization Options): Add missing @gol.
> 	(Directory Options): Likewise.
> 	(i386 and x86-64 Options): Likewise.
> 	(RS6000 and PowerPC Options): Likewise.
> 	(i386 and x86-64 Windows Options): Likewise.
> 	(V850 Options): Add text missing from descriptions.

This looks good, thanks for taking the time, Nick.

Gerald