Added missing configuration settings for Product Catalog

Author: mnocon

docs/administration/back_office/back_office_configuration.md

@@ -30,12 +30,13 @@ ibexa:
                 pagination:
                     attribute_definitions_limit: 10
                     attribute_groups_limit: 10
+                    currencies_limit: 10
                     customer_groups_limit: 10
                     customer_group_users_limit: 10
                     products_limit: 10
                     product_types_limit: 10
-                    product_view_custom_prices_limit: 10
                     regions_limit: 10
+                    product_view_custom_prices_limit: 10
                     catalogs_limit: 10
 ```