Defines the default patch baseline for the relevant operating system.To reset the Amazon Web Services-predefined patch baseline as the default, specify the full patch baseline Amazon Resource Name (ARN) as the baseline ID value. For example, for CentOS, specify arn:aws:ssm:us-east-2:733109147000:patchbaseline/pb-0574b43a65ea646ed instead of pb-0574b43a65ea646ed.