Make licensing notes consistent

zebra-network/Cargo.toml

@@ -7,7 +7,11 @@ description = "Networking code for Zebra"
 #
 # This licence is deliberately different to the rest of Zebra.
 #
-# zebra-network/src/peer_set/set.rs was modified from a 2019 version of:
+# Some code in:
+# zebra-network/src/peer_set/set.rs
+# zebra-network/src/peer_set/unready_service.rs
+# zebra-network/src/peer_set/initialize.rs
+# was modified from a 2019 version of:
 # https://github.com/tower-rs/tower/tree/master/tower/src/balance/p2c/service.rs
 license = "MIT"
 repository = "https://github.com/ZcashFoundation/zebra"

zebra-network/src/peer_set/initialize.rs

@@ -1,7 +1,8 @@
 //! A peer set whose size is dynamically determined by resource constraints.
-
-// Portions of this submodule were adapted from tower-balance,
-// which is (c) 2019 Tower Contributors (MIT licensed).
+//!
+//! The [`PeerSet`] implementation is adapted from the one in [tower::Balance][tower-balance].
+//!
+//! [tower-balance]: https://github.com/tower-rs/tower/tree/master/tower/src/balance
 
 use std::{
     collections::{BTreeMap, HashSet},

zebra-network/src/peer_set/set.rs

@@ -3,6 +3,7 @@
 //! # Implementation
 //!
 //! The [`PeerSet`] implementation is adapted from the one in [tower::Balance][tower-balance].
+//!
 //! As described in Tower's documentation, it:
 //!
 //! > Distributes requests across inner services using the [Power of Two Choices][p2c].

zebra-network/src/peer_set/unready_service.rs

@@ -1,6 +1,9 @@
-/// Services that are busy or newly created.
-///
-/// Adapted from tower-balance.
+//! Services that are busy or newly created.
+//!
+//! The [`UnreadyService`] implementation is adapted from the one in [tower::Balance][tower-balance].
+//!
+//! [tower-balance]: https://github.com/tower-rs/tower/tree/master/tower/src/balance
+
 use std::{
     future::Future,
     marker::PhantomData,