Fix "retriable" to "retryable" for the term consistency
All retriable-related fields and methods are using retryable term except in one comment.
@@ -588,7 +588,7 @@ func shouldRetryCancel(err error) bool {
return err.Temporary()
case nil:
// `awserr.Error.OrigErr()` can be nil, meaning there was an error but
- // because we don't know the cause, it is marked as retriable. See
+ // because we don't know the cause, it is marked as retryable. See
// TestRequest4xxUnretryable for an example.
return true
default:
