Update IMPLEMENTATION.md

Author: topi314

IMPLEMENTATION.md

@@ -40,12 +40,8 @@ All websocket ops are deprecated as of `v3.7.0` and replaced with the following
 
 ## Future breaking changes for v4
 
-> **Warning**
-> We are currently reconsidering these desicions. See https://github.com/lavalink-devs/Lavalink/discussions/859 for more info
-
 * HTTP endpoints not under a version path (`/v3`, `/v4`) will be removed except `/version` in v4.
 * `/v4/websocket` will not accept any websocket messages. In `v4` the websocket is only used for server-to-client messages.
-* The `/v3` API will still be available to be used.
 
 <details>
 <summary>Older versions</summary>