Merge pull request #444 from ImranLorgat/patch-29

Introduction - Tor Spelling

01_introduction.asciidoc

@@ -88,7 +88,7 @@ The Lightning Network is a network that operates as a "second layer" protocol on
  * Once a payment on the Lightning Network has completed, usually within a few seconds, it is final and cannot be reversed. Like a Bitcoin transaction, a payment on the Lightning Network can only be refunded by the recipient.
  * While "on-chain" Bitcoin transactions are broadcast and verified by all nodes in the network, payments routed on the Lightning Network are transmitted between pairs of nodes and are not visible to everyone, resulting in much greater privacy. 
  * Unlike transactions on the Bitcoin Network, payments routed on the Lightning Network do not need to be stored permanently. Lightning thus uses fewer resources, hence it is cheaper. This property also has benefits for privacy. 
- * The Lightning Network uses onion routing, similar to the protocol used by The Onion Router (TOR) privacy network, so that even the nodes involved in routing a payment are only directly aware of their predecessor and successor in the payment route.
+ * The Lightning Network uses onion routing, similar to the protocol used by The Onion Router (Tor) privacy network, so that even the nodes involved in routing a payment are only directly aware of their predecessor and successor in the payment route.
 
 [[user-stories]]
 === Lightning Network Use Cases, Users, and Their Stories