R1:3852ca632bd5

Display examples when editing configuratoin

Summary: Show example config values to the user when available.

Test Plan:
{F28465}
{F28466}

Reviewers: btrahan, codeblock

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2221, T2255

Differential Revision: https://secure.phabricator.com/D4311