refactor: improve the accuracy of docs/improve docs (#4845)

Co-authored-by: Noel <icrawltogo@gmail.com>

src/sharding/Shard.js

@@ -44,7 +44,7 @@ class Shard extends EventEmitter {
 
     /**
      * Arguments for the shard's process executable (only when {@link ShardingManager#mode} is `process`)
-     * @type {?string[]}
+     * @type {string[]}
      */
     this.execArgv = manager.execArgv;
 
@@ -96,7 +96,7 @@ class Shard extends EventEmitter {
      * @type {Function}
      * @private
      */
-    this._exitListener = this._handleExit.bind(this, undefined);
+    this._exitListener = this._handleExit.bind(this);
   }
 
   /**

src/sharding/ShardClientUtil.js

@@ -125,7 +125,7 @@ class ShardClientUtil {
   }
 
   /**
-   * Evaluates a script or function on all shards, in the context of the {@link Clients}.
+   * Evaluates a script or function on all shards, in the context of the {@link Client}s.
    * @param {string|Function} script JavaScript to run on each shard
    * @returns {Promise<Array<*>>} Results of the script execution
    * @example