fix doc for db_system

Author: zexinwanoci

website/docs/r/database_db_system.html.markdown

@@ -226,7 +226,7 @@ The following arguments are supported:
 * `node_count` - (Optional) The number of nodes to launch for a 2-node RAC virtual machine DB system. Specify either 1 or 2. 
 * `nsg_ids` - (Optional) (Updatable) A list of the [OCIDs](https://docs.cloud.oracle.com/iaas/Content/General/Concepts/identifiers.htm) of the network security groups (NSGs) that this resource belongs to. Setting this to an empty array after the list is created removes the resource from all NSGs. For more information about NSGs, see [Security Rules](https://docs.cloud.oracle.com/iaas/Content/Network/Concepts/securityrules.htm). **NsgIds restrictions:**
 	* Autonomous Databases with private access require at least 1 Network Security Group (NSG). The nsgIds array cannot be empty. 
-* `private_ip` - (Optional) A private IP address of your choice. Must be an available IP address within the subnet's CIDR. If you don't specify a value, Oracle automatically assigns a private IP address from the subnet. 
+* `private_ip` - (Optional) A private IP address of your choice. Must be an available IP address within the subnet's CIDR. If you don't specify a value, Oracle automatically assigns a private IP address from the subnet. Supported for VM BM shape.
 * `shape` - (Required) (Updatable) The shape of the DB system. The shape determines resources allocated to the DB system.
 	* For virtual machine shapes, the number of CPU cores and memory
 	* For bare metal and Exadata shapes, the number of CPU cores, memory, and storage