R1:a1a8b9ba657e

Clean up "HTTP Parameters" view a bit for EditEngine forms

Summary: Ref T10004. This lost a couple of fields when I rearranged how descriptions work. Restore them.

Test Plan:
- Viewed "Using HTTP Parameters".
- Everything had nice descriptions.
- No more weird phantom/misleading 'comment' transaction in UI.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10004

Differential Revision: https://secure.phabricator.com/D14822