qemu-options.hx: Change from recommending '?' to 'help'
Update the -help output and documentation so that it recommends 'help' rather than '?' for the various "list valid values for this option" cases. '?' is deprecated (as it can fail confusingly if not quoted), so it's better to steer users towards 'help'. ('?' still works, for backwards compatibility.) This is the -help option part of the change otherwise done in commit c8057f95, since we are now past release 1.2 and free to change our help text without worrying about breaking libvirt. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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