Update data-providers.md

fix typo `wich` to `which` and make the enclosing sentence read a little more naturally

Author: nealio82

core/data-providers.md

@@ -65,8 +65,8 @@ services:
 ```
 
 Tagging the service with the tag `api_platform.collection_data_provider` will enable API Platform Core to automatically
-register and use this data provider. The optional attribute `priority` allows to define the order in wich are called the
-data providers. The first data provider not throwing a `ApiPlatform\Core\Exception\ResourceClassNotSupportedException`
+register and use this data provider. The optional attribute `priority` allows to define the order in which the
+data providers are called. The first data provider not throwing a `ApiPlatform\Core\Exception\ResourceClassNotSupportedException`
 will be used.
 
 ## Custom Item Data Provider