Chapter 2 tweaks

chapter2.md

@@ -229,46 +229,31 @@ fn main() {
 
     // Bind a UDP socket to an arbitrary port
     let socket = UdpSocket::bind(("0.0.0.0", 43210)).unwrap();
-```
 
 
-Next we'll build our query packet. It's important that we remember to set the
-`recursion_desired` flag. As noted earlier, the packet id is arbitrary.
-
-```rust
+    // Build our query packet. It's important that we remember to set the
+    // `recursion_desired` flag. As noted earlier, the packet id is arbitrary.
     let mut packet = DnsPacket::new();
 
     packet.header.id = 6666;
     packet.header.questions = 1;
     packet.header.recursion_desired = true;
     packet.questions.push(DnsQuestion::new(qname.to_string(), qtype));
-```
 
-We can use our new write method to write the packet to a buffer...
-
-```rust
+    // Use our new write method to write the packet to a buffer...
     let mut req_buffer = BytePacketBuffer::new();
     packet.write(&mut req_buffer).unwrap();
-```
 
-...and send it off to the server using our socket:
-
-```rust
+    // ...and send it off to the server using our socket:
     socket.send_to(&req_buffer.buf[0..req_buffer.pos], server).unwrap();
-```
 
-To prepare for receiving the response, we'll create a new `BytePacketBuffer`.
-We'll then ask the socket to write the response directly into our buffer.
-
-```rust
+    // To prepare for receiving the response, we'll create a new `BytePacketBuffer`,
+    // and ask the socket to write the response directly into our buffer.
     let mut res_buffer = BytePacketBuffer::new();
     socket.recv_from(&mut res_buffer.buf).unwrap();
-```
 
-As per the previous section, `DnsPacket::from_buffer()` is then used to
-actually parse the packet after which we can print the response.
-
-```rust
+    // As per the previous section, `DnsPacket::from_buffer()` is then used to
+    // actually parse the packet after which we can print the response.
     let res_packet = DnsPacket::from_buffer(&mut res_buffer).unwrap();
     println!("{:?}", res_packet.header);