Updated Managed resource group to be non-readonly

Updated Managed resource group to be non-readonly

Author: Amogh Natu

specification/synapse/resource-manager/Microsoft.Synapse/preview/2019-06-01-preview/examples/CreateOrUpdateWorkspace.json

@@ -15,7 +15,8 @@
         },
         "sqlAdministratorLogin": "login",
         "sqlAdministratorLoginPassword": "password",
-        "managedVirtualNetwork": "default"
+        "managedVirtualNetwork": "default",
+        "managedResourceGroupName": "workspaceManagedResourceGroupUnique"
       },
       "location": "East US",
       "tags": {
@@ -46,7 +47,7 @@
           },
           "sqlAdministratorLogin": "login",
           "sqlAdministratorLoginPassword": "password",
-          "managedResourceGroupName": "resourceGroup2",
+          "managedResourceGroupName": "workspaceManagedResourceGroupUnique",
           "managedVirtualNetwork": "default",
           "provisioningState": "Succeeded",
           "privateEndpointConnections": [
@@ -90,7 +91,7 @@
           },
           "sqlAdministratorLogin": "login",
           "sqlAdministratorLoginPassword": "password",
-          "managedResourceGroupName": "resourceGroup2",
+          "managedResourceGroupName": "workspaceManagedResourceGroupUnique",
           "managedVirtualNetwork": "default",
           "provisioningState": "Provisioning"
         },

specification/synapse/resource-manager/Microsoft.Synapse/preview/2019-06-01-preview/workspace.json

@@ -756,8 +756,7 @@
           "type": "string"
         },
         "managedResourceGroupName": {
-          "description": "Workspace managed resource group",
-          "readOnly": true,
+          "description": "Workspace managed resource group. The resource group name uniquely identifies the resource group within the user subscriptionId. The resource group name must be no longer than 90 characters long, and must be alphanumeric characters (Char.IsLetterOrDigit()) and '-', '_', '(', ')' and'.'. Note that the name cannot end with '.'",
           "type": "string"
         },
         "provisioningState": {