[examples] Update constant and comments.

examples/interest2/src/main.leo

@@ -2,10 +2,10 @@
 function main(capital: u32, public rate: u32, periods: u8) -> u32 {
     console.assert(periods < 50u8);
     let amount: u32 = capital;
-    for i:u8 in 0u8..10u8 { // accrue for 10 periods
+    for i:u8 in 0u8..50u8 { // accrue for max 50 periods
         if i < periods {
             amount += amount * rate / 100u32; // round down
-        }
+        } // skip remaining periods
     }
     return amount;
 }