Minor change to the Celerity map formatting

Summary: Add a new line for clarity.

Test Plan: Inspected ./resources/celerity/map.php.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9931