fix: expand version 3 description

Co-authored-by: Levente Pap <levente.pap@iota.org>

crates/iota-protocol-config/src/lib.rs

@@ -25,6 +25,7 @@ pub const MAX_PROTOCOL_VERSION: u64 = 3;
 // SystemEpochInfoEventV1.
 // Version 3: Set the `relocate_event_module` to be true so that the module that
 // is associated as the "sending module" for an event is relocated by linkage.
+// Add `Clock` based unlock to `Timelock` objects. 
 
 #[derive(Copy, Clone, Debug, Hash, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
 pub struct ProtocolVersion(u64);