fd_hbs: better comment how a req. to delete non watched/crashed pid may happen
fd_hbs: better comment how a req. to delete non watched/crashed pid may happen

tectronics/scalaris,digshock/scalaris,tectronics/scalaris,tectronics/scalaris,tectronics/scalaris,seyyed/scalaris,seyyed/scalaris,digshock/scalaris,seyyed/scalaris,digshock/scalaris,tectronics/scalaris,digshock/scalaris,digshock/scalaris,tectronics/scalaris,digshock/scalaris,digshock/scalaris,seyyed/scalaris,seyyed/scalaris,seyyed/scalaris,seyyed/scalaris,tectronics/scalaris