feat v13: add addFollower on GuildChannelManager

#9050 djs

src/structures/NewsChannel.js

@@ -10,6 +10,7 @@ const { Error } = require('../errors');
 class NewsChannel extends BaseGuildTextChannel {
   /**
    * Adds the target to this channel's followers.
+   * <info>If you need the created webhook id, use {@link GuildChannelManager#addFollower}.</info>
    * @param {TextChannelResolvable} channel The channel where the webhook should be created
    * @param {string} [reason] Reason for creating the webhook
    * @returns {Promise<NewsChannel>}