Update basic sample

Assets/YooAsset/Samples~/Basic Sample/GameScript/Runtime/BootScene.cs

@@ -108,6 +108,7 @@ public class BootScene : MonoBehaviour
 	{
 		public bool QueryStreamingAssets(string fileName)
 		{
+			// 注意：使用了BetterStreamingAssets插件，使用前需要初始化该插件！
 			string buildinFolderName = YooAssets.GetStreamingAssetBuildinFolderName();
 			return BetterStreamingAssets.FileExists($"{buildinFolderName}/{fileName}");
 		}