Docs: Improve header anchor positioning (#2011)
Docs: Improve header anchor positioning (#2011)

When clicking on a method to jump to its documentation, the header of
said method is currently hidden because it's behind the fixed nav.

This css change will move header anchors up to accomodate the fixed
nav.
skovhus/jest,bookman25/jest,cpojer/jest,skovhus/jest,bookman25/jest,ide/jest,cpojer/jest,facebook/jest,ide/jest,bookman25/jest,mpontus/jest,facebook/jest,cpojer/jest,skovhus/jest,facebook/jest,mpontus/jest,ide/jest,mpontus/jest