PHUIDocumentViewPro tweaks

Summary: Use in MailCommands and HTTP Parameters

Test Plan: Tested MailCommands in Paste, HTTP Parameters in Paste, Legalpad, Diviner. Mobile and Desktop breakpoints.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14397