Add GroupSection lifecycle flow char into the doc
Add GroupSection lifecycle flow char into the doc

Summary: as title

Reviewed By: colriot

Differential Revision: D15965588

fbshipit-source-id: 02d47e877af904627328c003675b613fe8a0a28f

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