Update LinkedService.json (#12383)

Author: kesharma

specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json

@@ -5312,6 +5312,14 @@
           "description": "Access token for databricks REST API. Refer to https://docs.azuredatabricks.net/api/latest/authentication.html. Type: string (or Expression with resultType string).",
           "$ref": "../datafactory.json#/definitions/SecretBase"
         },
+        "authentication": {
+          "type": "object",
+          "description": "Required to specify MSI, if using Workspace resource id for databricks REST API. Type: string (or Expression with resultType string)."
+        },
+        "workspaceResourceId": {
+          "type": "object",
+          "description": "Workspace resource id for databricks REST API. Type: string (or Expression with resultType string)."
+        },
         "existingClusterId": {
           "type": "object",
           "description": "The id of an existing interactive cluster that will be used for all runs of this activity. Type: string (or Expression with resultType string)."
@@ -5378,8 +5386,7 @@
         }
       },
       "required": [
-        "domain",
-        "accessToken"
+        "domain"
       ]
     },
     "AzureDatabricksDeltaLakeLinkedService": {