Format example scripts better.

scripts/if1.rhai

@@ -1,3 +1,5 @@
+// This script runs if statements.
+
 let a = 42;
 let b = 123;
 let x = 999;
@@ -7,7 +9,7 @@ if a > b {
 } else if a < b {
     print("a < b, x should be 0");
 
-    let x = 0;          // this 'x' shadows the global 'x'
+    let x = 0;          // <- this 'x' shadows the global 'x'
     print(x);           // should print 0
 } else {
     print("Oops! a == b");