Also correct/check links in private item documentation

Author: TheBlueMatt

ci/check-compiles.sh

@@ -4,4 +4,5 @@ set -x
 echo Testing $(git log -1 --oneline)
 cargo check
 cargo doc
+cargo doc --document-private-items
 cd fuzz && cargo check --features=stdin_fuzz

lightning/src/ln/channel.rs

@@ -96,6 +96,7 @@ enum InboundHTLCState {
 	/// is used to derive commitment keys, which are used to construct the
 	/// signatures in a commitment_signed message.
 	/// Implies AwaitingRemoteRevoke.
+	///
 	/// [BOLT #2]: https://github.com/lightningnetwork/lightning-rfc/blob/master/02-peer-protocol.md
 	AwaitingRemoteRevokeToAnnounce(PendingHTLCStatus),
 	/// Included in a received commitment_signed message (implying we've revoke_and_ack'd it).