Merge rust-bitcoin/rust-secp256k1#666: Remove unnecessary code comment

458712212d Improve code comments (Tobin C. Harding)

Pull request description:

  These comments say what the code is doing, they add no value.

ACKs for top commit:
  Kixunil:
    ACK 458712212d
  apoelstra:
    ACK 458712212d

Tree-SHA512: 0f31d36d7dfbde5bf32d622c3ba1845d5c6989c3eff0e520b77eeee595453299551172331851176e50aef4f78eacb7033c0ff798077e44e1c63313013b073f0b

src/ecdsa/serialized_signature.rs

@@ -272,10 +272,8 @@ mod tests {
     #[test]
     fn iterator_ops_are_homomorphic() {
         let mut fake_signature_data = [0; MAX_LEN];
-        // fill it with numbers 0 - 71
         for (i, byte) in fake_signature_data.iter_mut().enumerate() {
-            // up to MAX_LEN
-            *byte = i as u8;
+            *byte = i as u8; // cast ok because MAX_LEN fits in  u8.
         }
 
         let fake_signature = SerializedSignature { data: fake_signature_data, len: MAX_LEN };