Minor linter fixes
Summary:
Fixed various linter issues that were identified with arc lint --everything.
- Changed tabs to spaces.
- Removed trailing newlines.
- Added whitespace on either side of binary operator.
- Added newline at EOF.
- Minor spelling fix.
- Removed leading newlines.
Test Plan: N/A
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Differential Revision: https://secure.phabricator.com/D8335