Update docs/resources/lb_frontend.md

Co-authored-by: Rémy Léone <[email protected]>

Author: Monitob

docs/resources/lb_frontend.md

@@ -128,7 +128,7 @@ The following arguments are supported:
 
 - `timeout_client` - (Optional) Maximum inactivity time on the client side. (e.g.: `1s`)
 
-- `certificate_ids` - (Optional) Collection of Certificate IDs that should be used by the frontend.
+- `certificate_ids` - (Optional) List of Certificate IDs that should be used by the frontend.
 
 - `acl` - (Optional) A list of ACL rules to apply to the load-balancer frontend.  Defined below.