Adding some docstrings on event classes
Adding some docstrings on event classes

diraol/kytos,cemsbr/kytos,renanrodrigo/kytos,kytos/kytos,cemsbr/kytos,kytos/kyco,macartur/kytos,diraol/kytos,erickvermot/kytos,erickvermot/kytos,erickvermot/kytos,cemsbr/kytos,diraol/kytos