R1:57cc30d0c4aa

Continue hammering new *.search / *.edit documentation into shape

Summary: Ref T9964. Create some docuemntation for this stuff, and clean up the *.edit endpoints a bit.

Test Plan: Read documentation.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9964

Differential Revision: https://secure.phabricator.com/D14798