docs: document the fuzz tests

Signed-off-by: ljedrz <[email protected]>

fuzz/fuzz_targets/deserialization.rs

@@ -3,6 +3,11 @@ use libfuzzer_sys::fuzz_target;
 
 use snarkos_environment::{network::Message, Client, CurrentNetwork};
 
+// This fuzz target tests network message deserialization, including
+// the deferred deserialization of the heavier objects.
+
+// To start fuzzing, run `cargo +nightly fuzz run deserialization`.
+
 fuzz_target!(|message: &[u8]| {
     if let Ok(message) = Message::<CurrentNetwork, Client<CurrentNetwork>>::deserialize(message.into()) {
         match message {

fuzz/fuzz_targets/network.rs

@@ -5,6 +5,11 @@ use bytes::BytesMut;
 use snarkos_environment::{network::MessageCodec, Client, CurrentNetwork};
 use tokio_util::codec::Decoder;
 
+// This fuzz target tests network message buffering and decoding; it does NOT include
+// the deferred deserialization of the heavier objects.
+
+// To start fuzzing, run `cargo +nightly fuzz run network`.
+
 fuzz_target!(|messages: Vec<&[u8]>| {
     let mut codec = MessageCodec::<CurrentNetwork, Client<CurrentNetwork>>::default();