Fix warnings: docs

ethcore/sync/src/chain/sync_packet.rs

@@ -22,15 +22,17 @@
 //! to convert to/from the packet id values transmitted over the
 //! wire.
 
+#![allow(unused_doc_comments)]
+
 use api::{ETH_PROTOCOL, WARP_SYNC_PROTOCOL_ID};
 use network::{PacketId, ProtocolId};
 
-/// An enum that defines all known packet ids in the context of
-/// synchronization and provides a mechanism to convert from
-/// packet ids (of type PacketId or u8) directly read from the network
-/// to enum variants. This implicitly provides a mechanism to
-/// check whether a given packet id is known, and to prevent
-/// packet id clashes when defining new ids.
+// An enum that defines all known packet ids in the context of
+// synchronization and provides a mechanism to convert from
+// packet ids (of type PacketId or u8) directly read from the network
+// to enum variants. This implicitly provides a mechanism to
+// check whether a given packet id is known, and to prevent
+// packet id clashes when defining new ids.
 enum_from_primitive! {
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub enum SyncPacket {