sample-code: print->println to match interpreter behavior

sample-code/fib.cl

@@ -2,10 +2,10 @@
 
 fn main() {
     for num in 0..=30 {
-        print("fib(", num, ") = ", fib_iterative(num))
+        println("fib(", num, ") = ", fib_iterative(num))
     }
     for num in 0..=30 {
-        print("fib(", num, ") = ", fib(num))
+        println("fib(", num, ") = ", fib(num))
     }
 }
 

sample-code/fizzbuzz.cl

@@ -7,7 +7,7 @@ fn main() {
 // Outputs FizzBuzz for numbers between `start` and `end`, inclusive
 fn fizzbuzz(start: i128, end: i128) {
     for x in start..=end {
-        print(if x % 15 == 0 {
+        println(if x % 15 == 0 {
             "FizzBuzz"
         } else if 0 == x % 3 {
             "Fizz"

sample-code/hello.cl

@@ -1,3 +1,3 @@
 fn main() {
-    print("Hello, world!")
+    println("Hello, world!")
 }