docs(core): added note on limits in openChat method

packages/core/src/highlevel/methods/chats/open-chat.ts

@@ -10,6 +10,10 @@ import { resolvePeer } from '../users/resolve-peer.js'
  * Some library logic depends on this, for example, the library will
  * periodically ping the server to keep the updates flowing.
  *
+ * > **Warning**: Opening a chat with `openChat` method will make the library make additional requests every so often.
+ * > Which means that you should **avoid opening more than 5-10 chats at once**, as it will probably trigger
+ * > server-side limits and you might start getting transport errors or even get banned.
+ *
  * @param chat  Chat to open
  */
 export async function openChat(client: ITelegramClient, chat: InputPeerLike): Promise<void> {