This can happen to anyone so don't be too hard on yourself. You can send another email today with the following " I just wanted to add that if you require any more information or any documentation please feel free to contact me and I will send it to you immediately. I would like to thank you again for the interview and restate my enthusiasm for the position"
This will be the email they remember and you can forget about the initial email.
Good Luck
Julia
Best-job-interview.com