docs: make collections more accessible in docs (#3907)

Fixes #3896

Author: iCrawl

src/util/Collection.js

@@ -3,11 +3,6 @@
 const BaseCollection = require('@discordjs/collection');
 const Util = require('./Util');
 
-/**
- * A Map with additional utility methods. This is used throughout discord.js rather than Arrays for anything that has
- * an ID, for significantly improved performance and ease-of-use.
- * @extends {BaseCollection}
- */
 class Collection extends BaseCollection {
   toJSON() {
     return this.map(e => (typeof e.toJSON === 'function' ? e.toJSON() : Util.flatten(e)));
@@ -17,6 +12,6 @@ class Collection extends BaseCollection {
 module.exports = Collection;
 
 /**
- * @external BaseCollection
- * @see {@link https://discord.js.org/#/docs/collection/}
+ * @external Collection
+ * @see {@link https://discord.js.org/#/docs/collection/master/class/Collection}
  */