Use a less-misleading example for Conduit custom constraints
See PHI2032. The Conduit UI shows some "Example Custom Constraints" that are intended to be generic, but use of "statuses" is misleading since many objects have a status and most of them don't support these specific values.
Make it more clear that these are generic values.
Test Plan: Read new text.
Differential Revision: https://secure.phabricator.com/D21637