erts: Clarify ERL_CRASH_DUMP_SECONDS docs
erts: Clarify ERL_CRASH_DUMP_SECONDS docs

especially default behavior without -heart,
which is wait indefinitely for crash dump.

bjorng/otp,bernardd/otp,cobusc/otp,getong/otp,cobusc/otp,jj1bdx/otp,electricimp/otp,lrascao/otp,saleyn/otp,vinoski/otp,electricimp/otp,falkevik/otp,rlipscombe/otp,bjorng/otp,bsmr-erlang/otp,legoscia/otp,tuncer/otp,kvakvs/otp,RaimoNiskanen/otp,matwey/otp,vinoski/otp,matwey/otp,vladdu/otp,tuncer/otp,lrascao/otp,vladdu/otp,bernardd/otp,legoscia/otp,getong/otp,goertzenator/otp,isvilen/otp,isvilen/otp,matwey/otp,RoadRunnr/otp,lrascao/otp,matwey/otp,vladdu/otp,bjorng/otp,lrascao/otp,emacsmirror/erlang,vinoski/otp,cobusc/otp,jj1bdx/otp,RaimoNiskanen/otp,vladdu/otp,mikpe/otp,g-andrade/otp,emacsmirror/erlang,saleyn/otp,bernardd/otp,legoscia/otp,bsmr-erlang/otp,electricimp/otp,emacsmirror/erlang,dumbbell/otp,isvilen/otp,potatosalad/otp,lrascao/otp,kvakvs/otp,matwey/otp,electricimp/otp,tuncer/otp,getong/otp,uabboli/otp,goertzenator/otp,bsmr-erlang/otp,mikpe/otp,falkevik/otp,dumbbell/otp,bjorng/otp,falkevik/otp,uabboli/otp,saleyn/otp,erlang/otp,falkevik/otp,ferd/otp,cobusc/otp,dumbbell/otp,goertzenator/otp,matwey/otp,bjorng/otp,RoadRunnr/otp,kvakvs/otp,getong/otp,g-andrade/otp,RaimoNiskanen/otp,matwey/otp,erlang/otp,erlang/otp,jj1bdx/otp,erlang/otp,tuncer/otp,mikpe/otp,bsmr-erlang/otp,tuncer/otp,emacsmirror/erlang,dumbbell/otp,potatosalad/otp,getong/otp,mikpe/otp,vladdu/otp,potatosalad/otp,fenollp/otp,saleyn/otp,emacsmirror/erlang,uabboli/otp,emacsmirror/erlang,potatosalad/otp,g-andrade/otp,erlang/otp,bjorng/otp,emacsmirror/erlang,ferd/otp,RoadRunnr/otp,bernardd/otp,dgud/otp,bernardd/otp,bernardd/otp,jj1bdx/otp,vinoski/otp,rlipscombe/otp,emacsmirror/erlang,g-andrade/otp,bernardd/otp,RaimoNiskanen/otp,falkevik/otp,jj1bdx/otp,legoscia/otp,kvakvs/otp,g-andrade/otp,rlipscombe/otp,potatosalad/otp,bernardd/otp,lrascao/otp,fenollp/otp,rlipscombe/otp,vladdu/otp,aboroska/otp,ferd/otp,vladdu/otp,bernardd/otp,aboroska/otp,rlipscombe/otp,g-andrade/otp,jj1bdx/otp,lrascao/otp,erlang/otp,fenollp/otp,bjorng/otp,isvilen/otp,goertzenator/otp,dumbbell/otp,goertzenator/otp,erlang/otp,getong/otp,getong/otp,fenollp/otp,falkevik/otp,isvilen/otp,cobusc/otp,kvakvs/otp,cobusc/otp,bsmr-erlang/otp,kvakvs/otp,RoadRunnr/otp,legoscia/otp,dumbbell/otp,goertzenator/otp,mikpe/otp,bjorng/otp,dgud/otp,fenollp/otp,bsmr-erlang/otp,saleyn/otp,cobusc/otp,bsmr-erlang/otp,aboroska/otp,g-andrade/otp,aboroska/otp,falkevik/otp,saleyn/otp,legoscia/otp,goertzenator/otp,lrascao/otp,mikpe/otp,rlipscombe/otp,kvakvs/otp,erlang/otp,mikpe/otp,bjorng/otp,uabboli/otp,dumbbell/otp,lrascao/otp,uabboli/otp,kvakvs/otp,vladdu/otp,RoadRunnr/otp,getong/otp,matwey/otp,aboroska/otp,vinoski/otp,ferd/otp,ferd/otp,uabboli/otp,vinoski/otp,jj1bdx/otp,fenollp/otp,dgud/otp,vladdu/otp,isvilen/otp,mikpe/otp,RaimoNiskanen/otp,rlipscombe/otp,falkevik/otp,vinoski/otp,RaimoNiskanen/otp,tuncer/otp,electricimp/otp,RaimoNiskanen/otp,rlipscombe/otp,dumbbell/otp,legoscia/otp,aboroska/otp,electricimp/otp,fenollp/otp,rlipscombe/otp,aboroska/otp,uabboli/otp,ferd/otp,electricimp/otp,jj1bdx/otp,legoscia/otp,mikpe/otp,electricimp/otp,g-andrade/otp,ferd/otp,potatosalad/otp,uabboli/otp,getong/otp,jj1bdx/otp,tuncer/otp,electricimp/otp,RaimoNiskanen/otp,legoscia/otp,RoadRunnr/otp,RoadRunnr/otp,vinoski/otp,dgud/otp,goertzenator/otp,potatosalad/otp,rlipscombe/otp,getong/otp,isvilen/otp,isvilen/otp,aboroska/otp,mikpe/otp,vinoski/otp,erlang/otp,isvilen/otp,dgud/otp,dgud/otp,saleyn/otp,dgud/otp,emacsmirror/erlang,fenollp/otp,bsmr-erlang/otp,falkevik/otp,tuncer/otp,saleyn/otp,emacsmirror/erlang,ferd/otp,dgud/otp,potatosalad/otp,kvakvs/otp,uabboli/otp,tuncer/otp,g-andrade/otp,RoadRunnr/otp,bjorng/otp,dumbbell/otp,dumbbell/otp,RaimoNiskanen/otp,g-andrade/otp,ferd/otp,isvilen/otp,potatosalad/otp,aboroska/otp,vinoski/otp,dgud/otp,goertzenator/otp,fenollp/otp,saleyn/otp,jj1bdx/otp,cobusc/otp,dgud/otp,RoadRunnr/otp,potatosalad/otp,bsmr-erlang/otp,erlang/otp,matwey/otp