Fix TestAccBigQueryDatasetAccess_authorizedRoutine and add note about…

… usage (GoogleCloudPlatform#7319)

mmv1/products/bigquery/api.yaml

@@ -311,6 +311,7 @@ objects:
       ~> **Note:** If this resource is used alongside a `google_bigquery_dataset` resource, the
       dataset resource must either have no defined `access` blocks or a `lifecycle` block with
       `ignore_changes = [access]` so they don't fight over which accesses should be on the dataset.
+      Additionally, both resource cannot be modified in the same apply.
     references: !ruby/object:Api::Resource::ReferenceLinks
       guides:
         'Controlling access to datasets': 'https://cloud.google.com/bigquery/docs/dataset-access-controls'

mmv1/third_party/terraform/tests/resource_bigquery_dataset_access_test.go

@@ -421,7 +421,6 @@ resource "google_bigquery_routine" "public" {
 
 resource "google_bigquery_dataset" "private" {
   dataset_id  = "%{private_dataset}"
-  description = "This dataset is private"
 }
 
 resource "google_bigquery_dataset_access" "authorized_routine" {