fix(doc): add external function doc

Signed-off-by: Jianxiang Ran <rxan_embedded@163.com>

docs/directory.json

@@ -274,6 +274,10 @@
 						{
 							"title": "使用 tensorflow_lite 原生插件调用 AI 模型",
 							"path": "guide/ai/tensorflow_lite"
+						},
+						{
+							"title": "使用外部函数调用 tensorflow_lite AI 模型",
+							"path": "guide/ai/tensorflow_lite_external_function_tutorial"
 						}
 					]
 				}
@@ -673,6 +677,10 @@
 							"path": "api/cli/plugins"
 						},
 						{
+							"title": "外部服务",
+							"path": "api/cli/services"
+						},
+						{
 							"title": "模式管理",
 							"path": "api/cli/schemas"
 						},
@@ -969,6 +977,10 @@
 						{
 							"title": "Running AI Model with TensorFlow Lite Function Plugin",
 							"path": "guide/ai/tensorflow_lite"
+						},
+						{
+							"title": "Running tensorflow_lite AI Model with external function",
+							"path": "guide/ai/tensorflow_lite_external_function_tutorial"
 						}
 					]
 				}
@@ -1368,6 +1380,10 @@
 							"path": "api/cli/plugins"
 						},
 						{
+							"title": "External Services",
+							"path": "api/cli/services"
+						},
+						{
 							"title": "Schemas",
 							"path": "api/cli/schemas"
 						},

docs/zh_CN/guide/ai/tensorflow_lite_external_function_tutorial.md

@@ -80,7 +80,7 @@ message LabelReply {
 - 有关文件格式和内容的更多详细信息，请参阅[这里](../../extension/external/external_func.md)。
 
 
-您可以在[示例代码]((https://github.com/lf-edge/ekuiper/blob/master/docs/resources/pythonGRPC.zip))的文件夹 ``kuiper_package`` 中获取示例 zip 文件。
+您可以在[示例代码](https://github.com/lf-edge/ekuiper/blob/master/docs/resources/pythonGRPC.zip)的文件夹 ``kuiper_package`` 中获取示例 zip 文件。
 
 
 ### 注册外部函数