ch01: relax description of LN privacy

ch01.asciidoc

@@ -9,7 +9,7 @@ Users of the LN are able to route payments to each other at virtually no cost an
 Users who transact on the LN do not need to wait for block confirmations for payments.
 Once a payment on the LN has completed, it is final and cannot be reversed: like a  Bitcoin transaction, a payment on the LN can only be refunded by the recipient.
 While "on-chain" Bitcoin transactions are broadcast and verified by all nodes in the network, transactions routed on the LN are transmitted between pairs of nodes and not visible to everyone, resulting in much greater privacy.
-The LN uses onion routing, similar to the protocol used by The Onion Router (TOR) privacy network, so that even the nodes involved in routing a transaction are incapable of identifying the source, recipient, or route.
+The LN uses onion routing, similar to the protocol used by The Onion Router (TOR) privacy network, so that even the nodes involved in routing a transaction are only directly aware of their predecessor and successor in route.
 
 === Motivation for the Lightning Network