docs(apple-silicon): improve example and add private_network informations

Author: Laure-di

docs/resources/apple_silicon_server.md

@@ -25,12 +25,10 @@ resource scaleway_apple_silicon_server server {
 resource scaleway_vpc vpc-apple-silicon {
   name = "vpc-apple-silicon"
 }
-
 resource scaleway_vpc_private_network pn-apple-silicon {
   name = "pn-apple-silicon"
   vpc_id = scaleway_vpc.vpc-apple-silicon.id
 }
-
 resource scaleway_apple_silicon_server my-server {
     name = "TestAccServerEnableVPC"
     type = "M2-M"
@@ -59,14 +57,13 @@ The following arguments are supported:
 - `enable_vpc` - (Optional, Default: false): Enables the VPC option when set to true.
 
 - `private_network` - (Optional) The private networks to attach to the server
-        - `id` - The private network ID
-        - `ipam_ip_ids` - A list of IPAM IP IDs to attach to the server.
+    - `id` - The private network ID
+    - `ipam_ip_ids` - A list of IPAM IP IDs to attach to the server.
 
 - `commitment_type` (Optional, Default: duration_24h): Activate commitment for this server
 
 - `public_bandwidth` (Optional) Configure the available public bandwidth for your server in bits per second. This option may not be available for all offers.
 
-
 ## Attributes Reference
 
 In addition to all arguments above, the following attributes are exported:
@@ -87,10 +84,10 @@ In addition to all arguments above, the following attributes are exported:
 - `organization_id` - The organization ID the server is associated with.
 - `vpc_status` - The current status of the VPC option.
 - `private_network` - The private networks to attach to the server
-      - `vlan`  - The VLAN ID associated with the private network.
-      - `status` - The current status of the private network.
-      - `created_at` - The date and time the private network was created.
-      - `updated_at` - The date and time the private network was last updated.
+    - `vlan`  - The VLAN ID associated with the private network.
+    - `status` - The current status of the private network.
+    - `created_at` - The date and time the private network was created.
+    - `updated_at` - The date and time the private network was last updated.
 
 ## Import