docs: document constructors of extendible structures (#3160)

* docs: document constructors of extendible structures

* docs(ClientPresence): document default value for data parameter

Co-Authored-By: SpaceEEC <spaceeec@yahoo.com>

* docs(Presence): document default value for data parameter

Co-Authored-By: SpaceEEC <spaceeec@yahoo.com>

* docs(DMChannel): capitalize DM in the constructor doc

src/structures/User.js

@@ -12,6 +12,10 @@ const { Error } = require('../errors');
  * @extends {Base}
  */
 class User extends Base {
+  /**
+   * @param {Client} client The instantiating client
+   * @param {Object} data The data for the user
+   */
   constructor(client, data) {
     super(client);