erts: Clarify erl_nif docs
erts: Clarify erl_nif docs

for enif_send and enif_select_read|write.

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