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