JoinHandle now in Codeblock and added note about channels

Author: Nereuxofficial

src/06_multiple_futures/04_spawning.md

@@ -5,9 +5,12 @@ while it is running.
 
 Say we have a web server that wants to accept connections without blocking the main thread. 
 To achieve this, we can use the `async_std::task::spawn` function to create and run a new task that handles the 
-connections. This function takes a future and returns a JoinHandle, which can be used to wait for the result of the 
+connections. This function takes a future and returns a `JoinHandle`, which can be used to wait for the result of the 
 task once it's completed.
 
 ```rust,edition2018
 {{#include ../../examples/06_04_spawning/src/lib.rs:example}}
-```
+```
+
+To communicate between the main task and the spawned task, we can use 
+provided by the used async runtime.