R1:ce62632e15f5

Add example for bugtraq.logregex with two parts

Summary: Also fix displaying array examples.

Test Plan: Used it in `linkBugtraq()`.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T3620

Differential Revision: https://secure.phabricator.com/D6667