Equals updates (#987)

* Docs update

Changed the param names and param descriptions to be consistent.

* Added === comparison

Changed Presence.equals and Game.equals to first compare using ===

* Collection.equals fix

Now returns false when collection is undefined, instead of crashing
💯

src/structures/GuildChannel.js

@@ -259,7 +259,7 @@ class GuildChannel extends Channel {
   /**
    * Checks if this channel has the same type, topic, position, name, overwrites and ID as another channel.
    * In most cases, a simple `channel.id === channel2.id` will do, and is much faster too.
-   * @param {GuildChannel} channel The channel to compare this channel to
+   * @param {GuildChannel} channel Channel to compare with
    * @returns {boolean}
    */
   equals(channel) {