Edit tutorial index.md
Edited the structure of sentences to make it easier to read
# Tutorial: Writing a chat
-Nothing is as simple as a chat server, right? Not quite, chat servers
-already expose you to all the fun of asynchronous programming: how
-do you handle clients connecting concurrently. How do you handle them disconnecting?
+Nothing is simpler than creating a chat server, right?
+Not quite, chat servers expose you to all the fun of asynchronous programming:
-How do you distribute the messages?
+How will the server handle clients connecting concurrently?
-In this tutorial, we will show you how to write one in `async-std`.
+How will it handle them disconnecting?
+
+How will it distribute the messages?
+
+This tutorial explains how to write a chat server in `async-std`.
You can also find the tutorial in [our repository](https://github.com/async-rs/async-std/blob/master/examples/a-chat).
