Updated Introduction (markdown)

Introduction.md

@@ -4,9 +4,12 @@ There are two types of expressions in Biosphere2:
 
 The usual workflow is that you first create a bunch of locations or vectors. In a second step you apply some transformation to them. And in a final step you do something with them. This is best shown by an example:
 ```
-set {_circle::*} to circle at player with radius 1 and density 5 #creation step (create locations in the shape of a circle)
-set {_bigcircle::*} to {_circle::*} scaled at player by 2 #transformation step (make circle 2 times larger)
-show happy villager at {_bigcircle::*} #do something with your locations
+# 1) creation step (create locations in the shape of a circle)
+set {_circle::*} to circle at player with radius 1 and density 5 
+# 2) transformation step (make circle 2 times larger)
+set {_bigcircle::*} to {_circle::*} scaled at player by 2 
+# 3) do something with your locations (not part of Biosphere2)
+show happy villager at {_bigcircle::*} 
 ```
 The result looks like this: