docs(bigquery): update description of query preview feature (#10554)

Author: shollyman

bigquery/bigquery.go

@@ -84,7 +84,7 @@ const DetectProjectID = "*detect-project-id*"
 // variables.  By setting the environment variable QUERY_PREVIEW_ENABLED to the string
 // "TRUE", the client will enable preview features, though behavior may still be
 // controlled via the bigquery service as well.  Currently, the feature(s) in scope
-// include: stateless queries (query execution without corresponding job metadata).
+// include: short mode queries (query execution without corresponding job metadata).
 func NewClient(ctx context.Context, projectID string, opts ...option.ClientOption) (*Client, error) {
 	o := []option.ClientOption{
 		option.WithScopes(Scope),