Typo correction (#658)

01_introduction.asciidoc

@@ -51,7 +51,7 @@ Now that you're familiar with these basic terms, let's move to a concept you are
 
 You will often hear people calling Bitcoin and the Lightning Network "trustless". At first glance this is confusing. After all, isn't trust a good thing? Banks even use it in their names! Isn't a "trustless" system, a system devoid of trust, a bad thing?
 
-The use of the the word "trustless" is intended to convey the ability to operate without _needing_ trust in the other participants in the system. In a decentralized system like Bitcoin, you can always choose to transact with someone you trust. However, the system ensures you can't be cheated even if you can't trust the other party in a transaction. Trust is a nice-to-have instead of a must-have property of the system.
+The use of the word "trustless" is intended to convey the ability to operate without _needing_ trust in the other participants in the system. In a decentralized system like Bitcoin, you can always choose to transact with someone you trust. However, the system ensures you can't be cheated even if you can't trust the other party in a transaction. Trust is a nice-to-have instead of a must-have property of the system.
 
 Contrast that to traditional systems like banking where you _must_ place your trust in a third party, since it controls your money. If the bank violates your trust, you may be able to find some recourse from a regulator or court, but at an enormous cost of time, money, and effort.
 

preface.asciidoc

@@ -184,6 +184,7 @@ Following is an alphabetically sorted list of all the GitHub contributors, inclu
 * Eduardo Lima III (@elima-iii)
 * Emilio Norrmann (@enorrmann)
 * Francisco Calderón (@grunch)
+* Giovanni Zotta (@GiovanniZotta)
 * Gustavo Silva (@GustavoRSSilva)
 * Haoyu Lin (@HAOYUatHZ)
 * Hatim Boufnichel (@boufni95)