remove font increase size from 1st 2 rows on docs filter lists

https://www.pivotaltracker.com/story/show/51566885
remove lead-in class
Merge pull request #658 from alphagov/unhighlight-first-rows-on-docs-lists

remove font increase size from 1st 2 rows on docs filter lists

https://www.pivotaltracker.com/story/show/51566885