message: reduce s3 retries, fix typo in error message
diff: @@ -31,7 +31,7 @@ impl S3Backend {
  let shared_config = runtime.block_on(aws_config::load_from_env());
  let mut config_builder = aws_sdk_s3::config::Builder::from(&shared_config)
  - .retry_config(RetryConfig::new().with_max_attempts(5))
  + .retry_config(RetryConfig::new().with_max_attempts(3))
  .region(Region::new(config.s3_region.clone()));
  if let Some(ref endpoint) = config.s3_endpoint {
  @@ -233,7 +233,7 @@ impl<'a> StorageTransaction for S3StorageTransaction<'a> {
  let to_delete = Delete::builder()
  .set_objects(Some(
  list.contents
  - .expect("didn't get context even though but key_count was > 0")
  + .expect("didn't get content even though key_count was > 0")
  .into_iter()
  .filter_map(|obj| {
  obj.key()
  