Disassociates a CIDR block from a subnet. Currently, you can disassociate an IPv6 CIDR block only. You must detach or delete all gateways and resources that are associated with the CIDR block before you can disassociate it.
ec2_disassociate_subnet_cidr_block(AssociationId)
[required] The association ID for the CIDR block.
svc$disassociate_subnet_cidr_block( AssociationId = "string" )