Update src/ipips/ipip-0484.md

Author: 2color

src/ipips/ipip-0484.md

@@ -67,7 +67,6 @@ The proposed change is to add a `?filter-protocols` parameter to the `GET /routi
 - Providers are filtered by checking if the transfer protocol name appears in the `Protocols` array (logical OR).
 - If the provider doesn't match any of the passed transfer protocols, the provider is omitted from the response.
 - If a provider passes the filter, it is returned unchanged, i.e. the full set of protocols is returned including protocols that not included in the filter. (note that this is different from `filter-addrs` where only the multiaddrs that pass the filter are returned)
-- Negative filtering is done by prefixing the protocol name with `!`, e.g. `?transport=!transport-graphsync-filecoinv1`.
 - Filtering is case-insensitive.
 - If no parameter is passed, the default behavior is to not filter by transfer protocol.