Deletes a DB security group.
rds_delete_db_security_group(DBSecurityGroupName)
[required] The name of the DB security group to delete.
You can't delete the default DB security group.
Constraints:
Must be 1 to 255 letters, numbers, or hyphens.
First character must be a letter
Can't end with a hyphen or contain two consecutive hyphens
Must not be "Default"
svc$delete_db_security_group( DBSecurityGroupName = "string" )
The specified DB security group must not be associated with any DB instances.