[PATCH, doc] Improve state of check_warning_flags.sh warnings.

[Gerald Pfeifer]

On Sun, 1 Mar 2009, Ralf Wildenhues wrote:
> contrib/ChangeLog:
> 2009-03-01  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
> 
> 	* check_warning_flags.sh: Update flag exceptions.

Please also update the copyright year.

> gcc/ChangeLog:
> 2009-03-01  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
> 
> 	* doc/invoke.texi (Warning Options): -Wsync-nand is C/C++ only.
> 	-Wno-pedantic-ms-format is for MinGW targets only.

Looks good, thanks.

Gerald