Update chapter4.md

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@ -197,7 +197,7 @@ fn main() {
// the raw bytes are simply returned, and if not it'll abort by restarting the
// loop and waiting for the next request. The `recv_from` function will write the
// data into the provided buffer, and return the length of the data read as well
// as the source adress. We're not interested in the length, but we need to keep
// as the source address. We're not interested in the length, but we need to keep
// track of the source in order to send our reply later on.
// Next, `DnsPacket::from_buffer` is used to parse the raw bytes into