fix(doc): SmartUniqueNamer suffixes

See: https://github.com/dustin10/VichUploaderBundle/blob/master/docs/namers.md
See: https://github.com/symfony/recipes-contrib/blob/main/vich/uploader-bundle/1.13/config/packages/vich_uploader.yaml

Author: petski

core/file-upload.md

@@ -43,7 +43,7 @@ vich_uploader:
         media_object:
             uri_prefix: /media
             upload_destination: '%kernel.project_dir%/public/media'
-            # Will rename uploaded files using a uniqueid as a prefix.
+            # Will rename uploaded files using a uniqueid as a suffix.
             namer: Vich\UploaderBundle\Naming\SmartUniqueNamer
 ```