Clarify time computation in send_request_resend.
Clarify time computation in send_request_resend.

jech/babeld,jech/babeld,wlanslovenija/babeld,Gwendocg/babeldToS,woniullb/babeld,Drooids/babeld,sudomesh/babeld,wlanslovenija/babeld,Gwendocg/babeldToS,tcatm/babeld,boutier/babeld,dtaht/babeld-shortrtt-metrics