R1:2951694c2737

Correctly spell 'committer'

Summary: It's a funny word. h/t @joshuaspence

Test Plan: Inspection of correct spelling.

Reviewers: epriestley, joshuaspence

Reviewed By: joshuaspence

Subscribers: Korvin, joshuaspence

Differential Revision: https://secure.phabricator.com/D19570