Updating debugserver docs
Updating debugserver docs

Summary: Adding more instructions for starting the debug server using idb.

Reviewed By: zeyadsalloum

Differential Revision: D17479529

fbshipit-source-id: d7db0925f0839fe7e71f300af9c942dd78dc53b2

facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl