Clarify supported view columns

docs/pages/docs/Getting started/advanced_dart_tables.md

@@ -294,9 +294,16 @@ abstract class CategoryTodoCount extends View {
 
 Inside a Dart view, use
 
-- abstract getters to declare tables that you'll read from (e.g. `TodosTable get todos`)
-- `Expression` getters to add columns: (e.g. `itemCount => todos.id.count()`);
-- the overridden `as` method to define the select statement backing the view
+- abstract getters to declare tables that you'll read from (e.g. `TodosTable get todos`).
+- `Expression` getters to add columns: (e.g. `itemCount => todos.id.count()`).
+- the overridden `as` method to define the select statement backing the view.
+  The columns referenced in `select` may refer to two kinds of columns:
+   - Columns defined on the view itself (like `itemCount` in the example above).
+   - Columns defined on referenced tables (like `categories.description` in the example).
+     For these references, advanced drift features like [type converters]({{ '../Advanced Features/type_converters.md' | pageUrl }})
+     used in the column's definition from the table are also applied to the view's column.
+
+   Both kind of columns will be added to the data class for the view when selected.
 
 Finally, a view needs to be added to a database or accessor by including it in the
 `views` parameter: