book: order set-up-connection code in top-down order

Author: djc

docs/book/src/bin/set-up-connection.rs

@@ -2,10 +2,7 @@ use quinn::{Endpoint, ServerConfig};
 use std::error::Error;
 use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 
-const SERVER_NAME: &str = "localhost";
-const LOCALHOST_V4: IpAddr = IpAddr::V4(Ipv4Addr::LOCALHOST);
-const CLIENT_ADDR: SocketAddr = SocketAddr::new(LOCALHOST_V4, 5000);
-const SERVER_ADDR: SocketAddr = SocketAddr::new(LOCALHOST_V4, 5001);
+fn main() {}
 
 #[allow(dead_code, unused_variables)] // Included in `set-up-connection.md`
 async fn server(config: ServerConfig) -> Result<(), Box<dyn Error>> {
@@ -35,4 +32,7 @@ async fn client() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
-fn main() {}
+const SERVER_NAME: &str = "localhost";
+const LOCALHOST_V4: IpAddr = IpAddr::V4(Ipv4Addr::LOCALHOST);
+const CLIENT_ADDR: SocketAddr = SocketAddr::new(LOCALHOST_V4, 5000);
+const SERVER_ADDR: SocketAddr = SocketAddr::new(LOCALHOST_V4, 5001);

docs/book/src/quinn/set-up-connection.md

@@ -12,7 +12,7 @@ It all starts with the [Endpoint][Endpoint] struct, this is the entry point of t
 Let's start by defining some constants.
 
 ```rust
-{{#include ../bin/set-up-connection.rs:5:8}}
+{{#include ../bin/set-up-connection.rs:35:38}}
 ```
 
 **Server**
@@ -22,7 +22,7 @@ The [server()][server] method, which can be used for this, returns the `Endpoint
 `Endpoint` is used to start outgoing connections and accept incoming connections.
 
 ```rust
-{{#include ../bin/set-up-connection.rs:11:23}}
+{{#include ../bin/set-up-connection.rs:8:20}}
 ```
 
 **Client**
@@ -32,7 +32,7 @@ The client needs to connect to the server using the [connect(server_name)][conne
 The `SERVER_NAME` argument is the DNS name, matching the certificate configured in the server.
 
 ```rust
-{{#include ../bin/set-up-connection.rs:26:36}}
+{{#include ../bin/set-up-connection.rs:23:33}}
 ```
 
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