Restyle services.md
Restyle services.md

Summary:
The information within services.md has already been through the review cycle and has been deemed ready for restyling.

This diff contains restyling of the content, including formatting, spelling, grammar, and link checking.

Differential Revision: D33710260

fbshipit-source-id: 349caa5aafdd90f0cff486ba2d8152ade881a891

facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho