Fix typo

Author: taiki-e

src/bounded.rs

@@ -231,7 +231,7 @@ impl<T> Bounded<T> {
             let slot = &self.buffer[index];
             let stamp = slot.stamp.load(Ordering::Acquire);
 
-            // If the the stamp is ahead of the head by 1, we may attempt to pop.
+            // If the stamp is ahead of the head by 1, we may attempt to pop.
             if head + 1 == stamp {
                 let new = if index + 1 < self.buffer.len() {
                     // Same lap, incremented index.