Move inline anchors up, to dolumn-level

Summary:
Fixes T8420. Now that hidden inlines no longer fold into a big clump, anchors can just jump to them in a normal way.

Move the anchors up a smidge so thing work.

Test Plan: Clicked an anchor pointed at a hidden inline, ended up in the right place.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T8420

Differential Revision: https://secure.phabricator.com/D17910