Change Security Group ValidationError for allowAllOubound from ipv6 to ipv4

Author: geotrieu

packages/aws-cdk-lib/aws-ec2/lib/security-group.ts

@@ -627,7 +627,7 @@ export class SecurityGroup extends SecurityGroupBase {
       // to "allOutbound=true" mode, because we might have already emitted
       // EgressRule objects (which count as rules added later) and there's no way
       // to recall those. Better to prevent this for now.
-      throw new ValidationError(lit`CannotAddTrafficEgressRule`, 'Cannot add an "all traffic" egress rule in this way; set allowAllOutbound=true (for ipv6) or allowAllIpv6Outbound=true (for ipv6) on the SecurityGroup instead.', this);
+      throw new ValidationError(lit`CannotAddTrafficEgressRule`, 'Cannot add an "all traffic" egress rule in this way; set allowAllOutbound=true (for ipv4) or allowAllIpv6Outbound=true (for ipv6) on the SecurityGroup instead.', this);
     }
 
     this.addDirectEgressRule(rule);