Typo in ch12.asciidoc

Fixes #261. "Alice LN node" -> "Alice's LN node"

ch12.asciidoc

@@ -434,7 +434,7 @@ In this example, we have 5 participants: Alice, Bob, Carol, Diana, and Eric. The
 
 Alice wants to pay Eric 1 bitcoin. However, Alice is not connected to Eric by a payment channel. Creating a payment channel requires a funding transaction, which must be committed to the bitcoin blockchain. Alice does not want to open a new payment channel and commit more of her funds. Is there a way to pay Eric, indirectly?
 
-Alice is running a Lightning Network (LN) node that is keeping track of her payment channel to Bob and has the ability to discover routes between payment channels. Alice LN node also has the ability to connect over the Internet to Eric's LN node. Eric's LN node creates a secret R using a random number generator. Eric's node does not reveal this secret to anyone. Instead, Eric's node calculates a hash +H+ of the secret +R+ and transmits this hash to Alice's node.
+Alice is running a Lightning Network (LN) node that is keeping track of her payment channel to Bob and has the ability to discover routes between payment channels. Alice's LN node also has the ability to connect over the Internet to Eric's LN node. Eric's LN node creates a secret R using a random number generator. Eric's node does not reveal this secret to anyone. Instead, Eric's node calculates a hash +H+ of the secret +R+ and transmits this hash to Alice's node.
 
 Now Alice's LN node constructs a route between Alice's LN node and Eric's LN node. The routing algorithm used will be examined in more detail later, but for now let's assume that Alice's node can find an efficient route.