fix: updated todo dApp main page title

docs/quick-start/developers/todo-app/index.md

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 5
-title: ToDo dApp Contract
+title: ToDo dApp Tutorial
 description: Moderately difficult smart contract and dApp
 ---
 
@@ -1129,4 +1129,4 @@ With the basics under your belt, consider exploring more advanced topics:
 
 The possibilities with blockchain technology and decentralized applications are endless. You're now well-equipped to take your ToDo dApp to the next level. Keep building, innovating, and exploring with aelf. 🚀
 
-Happy coding and expanding your **ToDo dApp! 😊**
+Happy coding and expanding your **ToDo dApp! 😊**