Update docs/backend/behaviors.md

Co-authored-by: Steve Piercy <[email protected]>

Author: jensens

docs/backend/behaviors.md

@@ -254,6 +254,8 @@ This field is not displayed in most views.
 To display the data entered in this field, you need to modify the page template by adding the `price_net` field as `context.price_net`.
 To access the `price_vat` and `price_gross` fields from a browser view, you need to get the adapter from the context of the view:
 
+(behavior-code-example)=
+
 ```python
 from .price import IPriceBehavior