Fix loads of JSDoc type issues

src/sharding/Shard.js

@@ -10,7 +10,7 @@ class Shard {
   /**
    * @param {ShardingManager} manager The sharding manager
    * @param {number} id The ID of this shard
-   * @param {array} [args=[]] Command line arguments to pass to the script
+   * @param {Array} [args=[]] Command line arguments to pass to the script
    */
   constructor(manager, id, args = []) {
     /**

src/sharding/ShardClientUtil.js

@@ -127,7 +127,7 @@ class ShardClientUtil {
   /**
    * Creates/gets the singleton of this class
    * @param {Client} client Client to use
-   * @returns {ShardUtil}
+   * @returns {ShardClientUtil}
    */
   static singleton(client) {
     if (!this._singleton) {