Improve formatting of voice sample app README

samples/tutorials/voice/README.md

- * Make sure that you use a voice SIM and not a data SIM for this tutorial.
- * This tutorial only allows you to make a phone call from mangOH to another phone
- * Insert a headset audio jack into CN500 to listen to the audio
- * Mangoh must be registered on Network with the SIM in ready state.
- * Make sure voiceCallService is started by entering: `app start voiceCallService`
- * Check "logread -f "
- * Execute app : app runProc  mangohVoiceCall --exe=mangohVoiceCall --  <Destination phone number>
- * Follow INFO instruction in traces.
- 
+mangOH Voice Call Tutorial App
+==============================
+
+This app demonstrates the ability to place a call from a mangOH board to another phone.
+
+Steps to Run
+------------
+1. Install a voice-capable SIM card into a mangOH Green board
+1. mangOH must be registered on the network with the SIM in the ready state
+1. Insert a headset audio jack into CN500 to listen to the audio
+1. Make sure voiceCallService is running by executing `app start voiceCallService`
+1. Execute `logread -f` in a separate terminal to view logs while placing the voice call
+1. Execute `app runProc mangohVoiceCall --exe=mangohVoiceCall -- <Destination phone number>`
+1. Answer the phone call at the remote end
+1. Terminate the call by hanging up on the remote phone