Fixed example for ibexa_format_price (#3178)

* Fixed example for ibexa_format_price

* Apply suggestions from code review

Co-authored-by: Adrien Dupuis <61695653+adriendupuis@users.noreply.github.com>

---------

Co-authored-by: Adrien Dupuis <61695653+adriendupuis@users.noreply.github.com>

Author: mnocon

docs/templating/twig_function_reference/product_twig_functions.md

@@ -112,9 +112,9 @@ The `ibexa_format_price` filter formats the price value by placing currency code
 #### Examples
 
 ``` html+twig
-{% for product.price in product.attributes %}
-    {{ product.price.getMoney()|ibexa_format_price }}
-{% endfor %}
+{{ order.getValue().getTotalGross()|ibexa_format_price }}
+
+{{ ibexa_get_original_price(discount_product)|ibexa_format_price ?: '-' }}
 ```
 
 ### `ibexa_is_pim_local`