fix error

docs/hardware/zh/tang/Tang-Nano-Doc/examples.md

@@ -62,6 +62,12 @@ Github: https://github.com/sipeed/TangNano-9K-example
 - HDMI 示例：参考 [PicoRV 在9K上运行的示例](./../Tang-Nano-9K/examples/picorv.md)
 - litex 在 9K 支持：https://github.com/litex-hub/litex-boards
 
+## Tang Nano 20K
+
+Github: https://github.com/sipeed/TangNano-20K-example
+
+
+
 ## 哔哩哔哩视频
 
 > 感谢 [ZQ坐看云起时](https://space.bilibili.com/375786914/video) 友情制作

docs/soft/maixpy3/zh/usage/AI_net/resnet.ipynb

@@ -171,8 +171,8 @@
     }
    ],
    "source": [
-    "import sys\n",
-    "sys.path.append("/home/res/") \n",
+    "import sys \n",
+    "sys.path.append(\"/home/res/\") \n",
     "from classes_label import labels \n",
     "from maix import camera, nn, display\n",
     "resnet = Resnet()\n",