docs(spanner): Add doc to Row type indicating how to scan JSON columns
@@ -65,6 +65,8 @@ import (
// *Date(not NULL), *NullDate - DATE
// *[]civil.Date, *[]NullDate - DATE ARRAY
// *[]*some_go_struct, *[]NullRow - STRUCT ARRAY
+// *NullJSON - JSON
+// *[]NullJSON - JSON ARRAY
// *GenericColumnValue - any Cloud Spanner type
//
// For TIMESTAMP columns, the returned time.Time object will be in UTC.
