Remove default location from gcs module (#2303)

* gcs module

* blueprints/apigee/bigquery-analytics

* tfdoc

* pubsub README md syntax

modules/folder/README.md

@@ -209,6 +209,7 @@ module "gcs" {
   project_id    = var.project_id
   prefix        = var.prefix
   name          = "gcs_sink"
+  location      = "EU"
   force_destroy = true
 }