Expanding recommendation for finishView()...

... to include the widgets created by ChoiceType as well.

Might conflict with a minor change I just did in #17066

Author: ThomasLandauer

form/create_custom_field_type.rst

@@ -146,9 +146,10 @@ These are the most important methods that a form type class can define:
     extensions, but you can create any custom option you need.
 
 ``finishView()``
-    When creating a form type that consists of many fields, this method allows
-    to modify the "view" of any of those fields. For any other use case, it's
-    recommended to use instead the ``buildView()`` method.
+    This method allows to modify the "view" of any rendered widget. This is useful
+    if your form type consists of many fields, or contains a type that produces
+    many HTML elements (e.g. ``ChoiceType``). For any other use case, it's
+    recommended to use ``buildView()`` instead.
 
 ``getParent()``
     If your custom type is based on another type (i.e. they share some