Don't link objects after a hyphen

Summary: Fixes T5714. Don't link objects when their names appear after a hyphen.

Test Plan: Tested F123 (link), (F123) (link), G12-F123 (no link).

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5714

Differential Revision: https://secure.phabricator.com/D10456