docs(filters): remove global order_nulls_comparison (available only in 2.7)

Author: alanpoulain

core/filters.md

@@ -755,15 +755,6 @@ App\Entity\Offer:
 
 [/codeSelector]
 
-The strategy to use by default can be configured globally:
-
-```yaml
-# api/config/packages/api_platform.yaml
-api_platform:
-    collection:
-        order_nulls_comparison: 'nulls_smallest'
-```
-
 #### Using a Custom Order Query Parameter Name
 
 A conflict will occur if `order` is also the name of a property with the search filter enabled.