Adjust tutorial wording

Author: gbaman

tutorials/cyber-kingdom/firewall/firewall_1.md

@@ -9,7 +9,7 @@ It is based on created allow or deny rules to allow or deny different types of t
 In this task, you will be building up a series of rules to allow or deny different characters into the castle.
 
 ## Villagers @unplugged
-It looks like there are a group of villagers on their way. Let's start by creating a firewall that allows all.   
+It looks like there are a group of villagers on their way. We should let them into the castle. Let's start by creating a firewall that allows all.   
 ![Villages](https://raw.githubusercontent.com/CausewayDigital/Minecraft-EE-MakeCode/main/tutorials/cyber-kingdom/firewall/images/level_1.jpg)
 ## Step 1
 It looks like there are a group of villagers on their way. Let's start by creating a firewall that allows all.   

tutorials/cyber-kingdom/firewall/firewall_3.md

@@ -20,7 +20,8 @@ It's a Virus!
 
 ## Stop the virus
 Add another rule to stop the virus. 
-Can you see anything that might help us distinguish between a villager and a virus?
+Can you see anything that might help us distinguish between a villager and a virus?   
+Remember, you can press the < (back) button to check the lookout view again.
 
 
 ```template

tutorials/cyber-kingdom/firewall/firewall_5.md

@@ -21,7 +21,7 @@ Be careful, the rival kingdom has been known to try and send spies through our g
 
 
 ## Spies!
-Make sure not to let the spies in, they try to use a disguise so they won't be recognised.   
+Make sure not to let the spies in, they try to use a disguise so they won't be recognized.   
 I wonder how we could differentiate them from normal villagers?