Fix example

The aliases file works the other way around.

doc/barrier.conf.example-advanced

@@ -50,6 +50,6 @@ end
 # One way to find the actual name of a computer is to run hostname from a command window
 section: aliases
 	# Laptop is actually known as John-Smiths-MacBook-3.local
-	John-Smiths-MacBook-3.local:
-		desktop2
+	desktop2:
+		John-Smiths-MacBook-3.local
 end

doc/barrier.conf.example-basic

@@ -34,6 +34,6 @@ end
 
 section: aliases
 	# The "real" name of iMac is John-Smiths-iMac-3.local. If we wanted we could remove this alias and instead use John-Smiths-iMac-3.local everywhere iMac is above. Hopefully it should be easy to see why using an alias is nicer
-	John-Smiths-iMac-3.local:
-		iMac
+	iMac:
+		John-Smiths-iMac-3.local
 end