Storage class for infrequent access should be documented since it should be available now

Storage class for infrequent access and it's availability in zones should be documented since it should be available from now on

> Le niveau de stockage Standard Infrequent Access sera disponible à partir du 04-06-2025

https://github.com/ovh/docs/blob/develop/pages/storage_and_backup/object_storage/s3_location/guide.fr-fr.md