erl_bifs: Add a note to the comment for is_pure/3
erl_bifs: Add a note to the comment for is_pure/3

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