Updating AIB API reference page to show VNet config information for all tabs and not just for the Bicep tab

Author: sumit-kalra

articles/virtual-machines/linux/image-builder-json.md

@@ -1721,6 +1721,8 @@ vnetConfig: {
 }
 ```
 
+---
+
 #### subnetId
 Resource ID of a pre-existing subnet on which the build VM and validation VM is deployed.
 
@@ -1745,8 +1747,6 @@ This field can be specified only if `subnetId` is also specified and must meet t
 #### proxyVmSize (optional)
 Size of the proxy virtual machine used to pass traffic to the build VM and validation VM. This field must not be specified if `containerInstanceSubnetId` is specified because no proxy virtual machine is deployed in that case. Omit or specify empty string to use the default (Standard_A1_v2).
 
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-
 ## Image Template Operations
 
 ### Starting an Image Build