Update 01_introduction.asciidoc (#646)

* Update 01_introduction.asciidoc

* Update 02_getting_started.asciidoc

typos and removed broken lightning link

01_introduction.asciidoc

@@ -53,9 +53,7 @@ Contrast that to traditional systems, like banking where you _must_ place your t
 
 Trustless does not mean devoid of trust. It means that trust is not a necessary prerequisite to all transactions and that you can transact even with people you don't trust because the system prevents cheating.
 
-Before we get into how the Lightning Network works, it's important to understand one basic concept that underlies Bitcoin, the Lightning Network and many other such systems: something we call a _fairness protocol_. A fairness proctocol is a way to
-
-_achieve fair outcomes between participants, who do not need to trust each other, without the need for a central authority_ and it is the backbone of decentralized systems like Bitcoin.
+Before we get into how the Lightning Network works, it's important to understand one basic concept that underlies Bitcoin, the Lightning Network and many other such systems: something we call a _fairness protocol_. A fairness proctocol is a way to _achieve fair outcomes between participants, who do not need to trust each other, without the need for a central authority_ and it is the backbone of decentralized systems like Bitcoin.
 
 
 === Fairness without central authority

02_getting_started.asciidoc

@@ -20,7 +20,6 @@ The below is an inexhaustive list (in alphanumerical order):
 * ACINQ's Lightning explorer, with fancy visualization, https://explorer.acinq.co/
 * Fiatjaf's Lightning explorer with many diagrams, https://ln.bigsun.xyz/
 * hashXP Lightning explorer, https://hashxp.org/lightning/node/
-* Lightblock Lightning explorer, https://lightblock.me/
 
 [TIP]
 ====
@@ -67,7 +66,7 @@ The most important questions to ask about a specific wallet are:
 
 [TIP]
 ====
-If a Lightning wallet uses a third-party Lightning node, it is this third-party Lightning node that decides how to communicate with Bitcoin. Hence, using a third-party Lightning node implies that you are also using a third-party Bitcoin node. Only when when the Lightning wallet uses its own Lightning node, does the choice "full Bitcoin-node" vs. "third-party Bitcoin node" exist.
+If a Lightning wallet uses a third-party Lightning node, it is this third-party Lightning node that decides how to communicate with Bitcoin. Hence, using a third-party Lightning node implies that you are also using a third-party Bitcoin node. Only when the Lightning wallet uses its own Lightning node, does the choice "full Bitcoin-node" vs. "third-party Bitcoin node" exist.
 ====
 
 At the highest level of abstraction, questions 1 and 3 are the most elementary ones.