doc(tracing): added a little something about how to activate Tracing
doc(tracing): added a little something about how to activate Tracing

laurentpetit/ccw,noncom/ccw,ccw-ide/ccw,laurentpetit/ccw,noncom/ccw,michelangelo13/ccw,noncom/ccw,michelangelo13/ccw,ccw-ide/ccw,laurentpetit/ccw,ccw-ide/ccw,michelangelo13/ccw