message: add another comment about random nonces
diff: @@ -8,8 +8,11 @@ pub(super) struct Csp {
  impl Csp {
  fn new() -> Self {
  + // Nonces need to be different for each single request in order to maintain security, so we
  + // generate a new one with a cryptographically-secure generator for each request.
  let mut random = [0u8; 36];
  getrandom::getrandom(&mut random).expect("failed to generate a nonce");
  +
  Self {
  nonce: base64::encode(&random),
  suppress: false,
  