add title for lecture 17 in different section

Author: xuwenhao

17_langchain_agent.ipynb

@@ -1,5 +1,13 @@
 {
  "cells": [
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 选择题"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 8,
@@ -104,6 +112,14 @@
     "print(choice_chain(question))"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Agent实现"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 13,
@@ -236,6 +252,14 @@
     "print(result)"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 通过max_iterations限制重试次数"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 18,
@@ -274,6 +298,14 @@
     "print(\"===\")"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 通过VectorDBQA让Tool支持问答"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 19,
@@ -565,6 +597,14 @@
     "print(answer)"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 优化Prompt让AI不要胡思乱想"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 31,
@@ -762,6 +802,14 @@
     "print(answer)"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 通过多轮对话实现订单查询"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 36,