Various linter fixes.

Summary:
- Removed trailing newlines.
- Added newline at EOF.
- Removed leading newlines.
- Trimmed trailing whitespace.
- Spelling fix.
- Added newline at EOF

Test Plan: N/A

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: hach-que, chad, Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8344

src/applications/diffusion/controller/DiffusionServeController.php

@@ -601,4 +601,3 @@ final class DiffusionServeController extends DiffusionController {
   }
 
 }
-