fixed typo in Tutorials section of Ethereum for Dart developers doc

Author: CodeDragonVN

src/content/developers/docs/programming-languages/dart/index.md

@@ -15,7 +15,7 @@ incomplete: true
   3.  Writing a user interface in Dart
 - [Building a Mobile dapp with Flutter](https://medium.com/dash-community/building-a-mobile-dapp-with-flutter-be945c80315a) is a lot shorter, which might be better
   if you already know the basics
-- If you prefer the learn by watching a video, you can watch [Build Your First Blockchain Flutter App](https://www.youtube.com/watch?v=3Eeh3pJ6PeA), which is about an hour long
+- If you prefer to learn by watching a video, you can watch [Build Your First Blockchain Flutter App](https://www.youtube.com/watch?v=3Eeh3pJ6PeA), which is about an hour long
 - If you are impatient, you might prefer [Building a Blockchain Decentralized-app with Flutter and Dart on Ethereum](https://www.youtube.com/watch?v=jaMFEOCq_1s), which is only about twenty minutes
 - [Integrating MetaMask in Flutter application](https://youtu.be/8qzVDje3IWk) - this short video takes you through the steps of integrating MetaMask into your Flutter applications