erts: Improve send/2 docs
erts: Improve send/2 docs

with link to ! operator
and clarify ugly badarg for unregistered atom argument.

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