[model card] fix md table
Just noticed, I had a borked md table that wasn't rendering as a table on the site in a few cards, this PR fixes that.

Thank you!

@julien-c
 

Looks good now!
<img width="645" alt="Screenshot 2020-11-08 at 10 25 27" src="https://user-images.githubusercontent.com/326577/98461482-748c2380-217a-11eb-9fe4-38d6dc555233.png">
