Simple small comma adjustments (#600)
Simple small comma adjustments (#600)

Summary:
Not important, just fixing a few commas.

## Changelog
Pull Request resolved: https://github.com/facebook/flipper/pull/600

Differential Revision: D18087297

Pulled By: passy

fbshipit-source-id: 00d867af4b2e294b55cbc5ed4ebb3a2b0261d598

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