Remove blank line between docblock and function call

Summary: Minor change. Remove a blank line so that the docblock and function call are touching (in the __phutil_library_map__.php file).

Test Plan: Ran arc liberate.

Reviewers: epriestley, Blessed Reviewers, chad

Reviewed By: Blessed Reviewers, chad

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9869