[socket|doc] Add a tiny bit more header text and an example
[socket|doc] Add a tiny bit more header text and an example

Add a bit more text in the (socket) module description.
Also added a (very) basic example.

OTP-14831

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