Services / DI docs
Services / DI docs

Summary: Small restructuring, new intro and splitting the snippets to be more digestible.

Reviewed By: muraziz

Differential Revision: D25589710

fbshipit-source-id: 32842e59f870161ecf23aadcd55cde4edd9220d0

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