Update syntax

recitation-sessions/solution-2.md

@@ -20,11 +20,11 @@ def uncurry2(f: Double => Int => Boolean): (Double, Int) => Boolean =
 def fixedPoint(f: Int => Int): Int => Int = {
 
   @tailrec
-  def go(x: Int): Int = {
+  def rec(x: Int): Int = {
     val y = f(x)
-    if (x == y) x else go(y)
+    if x == y then x else rec(y)
   }
 
-  go
+  rec
 }
 ```