FIX: wrong key in object-stroage config in filesystem.md (#1696)

"options:" does not exist anymore in config and was not removed here but later in the docs. This will result in an "access denied" error as soon as file system calls are made, despite valid credentials.

guides/hosting/infrastructure/filesystem.md

@@ -92,11 +92,10 @@ shopware:
         bucket: "{{AWS_BUCKET}}"
         region: "{{AWS_REGION}}"
         endpoint: "{{AWS_ENDPOINT}}"
-        options:
-          visibility: "public"
-          credentials:
-            key: "{{AWS_ACCESS_KEY_ID}}"
-            secret: "{{AWS_SECRET_ACCESS_KEY}}"
+        visibility: "public"
+        credentials:
+          key: "{{AWS_ACCESS_KEY_ID}}"
+          secret: "{{AWS_SECRET_ACCESS_KEY}}"
     theme:
       type: "local"
       url: "https://your.domain/public"