modify Statement

server/nng/NNG/Levels/Tutorial/Level_1.lean

@@ -10,14 +10,14 @@ Introduction
 "
 Each level in this game involves proving a mathematical statement. In this first level
 you have three natural numbers $x, y, z$ (listed under \"Objects\") and you want to prove
-$x \\cdot y + z = x \\cdot y + z$ (displayed under \"Goal\").
+$xy + z = xy + z$ (displayed under \"Goal\").
 
-You can modify the Goal using *Tactics* until you can close (i.e. prove) it. 
+You can modify the Goal using *Tactics* until you can close it (i.e. prove it).
 
 The first tactic is called `rfl`, which stands for \"reflexivity\",
 a fancy way of saying that it will prove any goal of the form `A = A`. It doesn't matter how
 complicated `A` is, all that matters is that the left hand side is exactly equal to the right hand
-side (a computer scientist would say \"definitionally equal\"). I really mean \"press the same buttons
+side. I really mean \"press the same buttons
 on your computer in the same order\" equal. For example, `x * y + z = x * y + z` can be proved by `rfl`,
 but `x + y = y + x` cannot.
 "

server/nng/NNG/Levels/Tutorial/Level_2.lean

@@ -33,11 +33,11 @@ Statement
   "Now both sides are identical, so you can use `rfl` to close the goal."
   rfl
 
-NewTactic rewrite rw
+NewTactic rw
 
 Conclusion
 "
-If you want to see the entire proof you created, toggle \"Editor mode\" above.
+If you want to inspect the proof you created, toggle \"Editor mode\" above.
 
 There you can also move your cursor around the proof to see the \"state\" of the proof at this point.