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/Role.js

@@ -302,7 +302,7 @@ class Role {
    * Whether this role equals another role. It compares all properties, so for most operations
    * it is advisable to just compare `role.id === role2.id` as it is much faster and is often
    * what most users need.
-   * @param {Role} role The role to compare to
+   * @param {Role} role Role to compare with
    * @returns {boolean}
    */
   equals(role) {