Update variables file

variables.tf

@@ -60,7 +60,7 @@ variable "db_backup_retention_period" {
 }
 
 variable "storage_type" {
-  description = "One of 'standard' (magnetic), 'gp2' (general purpose SSD), 'gp3' (new generation of general purpose SSD), 'io1' (provisioned IOPS SSD), or 'io2' (new generation of provisioned IOPS SSD). The default is 'io1' if iops is specified, 'gp2' if not. If you specify 'io2' or 'gp3' , you must also include a value for the 'iops' parameter"
+  description = "One of 'standard' (magnetic), 'gp2' (general purpose SSD), 'gp3' (new generation of general purpose SSD), 'io1' (provisioned IOPS SSD), or 'io2' (new generation of provisioned IOPS SSD). If you specify 'io2', you must also include a value for the 'iops' parameter and the `allocated_storage` must be at least 100 GiB (except for SQL Server which the minimum is 20 GiB)."
   type        = string
   default     = "gp3"
 }