[kernel|doc] Add text for the new i/0,1,2 functions
[kernel|doc] Add text for the new i/0,1,2 functions

Add documentation for the new i/0,1,2 functions and the
info-keys type (used by these function(s)).

OTP-17376

jj1bdx/otp,getong/otp,getong/otp,bjorng/otp,jj1bdx/otp,mikpe/otp,jj1bdx/otp,erlang/otp,uabboli/otp,bjorng/otp,potatosalad/otp,emacsmirror/erlang,dumbbell/otp,g-andrade/otp,mikpe/otp,dumbbell/otp,dgud/otp,vinoski/otp,getong/otp,uabboli/otp,dumbbell/otp,erlang/otp,emacsmirror/erlang,dumbbell/otp,ferd/otp,getong/otp,getong/otp,mikpe/otp,rlipscombe/otp,g-andrade/otp,g-andrade/otp,dumbbell/otp,rlipscombe/otp,emacsmirror/erlang,rlipscombe/otp,emacsmirror/erlang,dgud/otp,jj1bdx/otp,erlang/otp,uabboli/otp,dgud/otp,ferd/otp,dgud/otp,g-andrade/otp,rlipscombe/otp,emacsmirror/erlang,ferd/otp,isvilen/otp,isvilen/otp,jj1bdx/otp,potatosalad/otp,rlipscombe/otp,isvilen/otp,mikpe/otp,vinoski/otp,mikpe/otp,bjorng/otp,ferd/otp,rlipscombe/otp,mikpe/otp,erlang/otp,uabboli/otp,isvilen/otp,dgud/otp,dgud/otp,dgud/otp,ferd/otp,jj1bdx/otp,jj1bdx/otp,potatosalad/otp,getong/otp,isvilen/otp,jj1bdx/otp,vinoski/otp,dgud/otp,isvilen/otp,vinoski/otp,mikpe/otp,ferd/otp,dgud/otp,ferd/otp,emacsmirror/erlang,getong/otp,bjorng/otp,bjorng/otp,potatosalad/otp,potatosalad/otp,vinoski/otp,bjorng/otp,dumbbell/otp,dumbbell/otp,jj1bdx/otp,mikpe/otp,rlipscombe/otp,mikpe/otp,potatosalad/otp,isvilen/otp,g-andrade/otp,uabboli/otp,g-andrade/otp,uabboli/otp,erlang/otp,potatosalad/otp,dumbbell/otp,dgud/otp,bjorng/otp,g-andrade/otp,emacsmirror/erlang,isvilen/otp,g-andrade/otp,jj1bdx/otp,erlang/otp,ferd/otp,dumbbell/otp,ferd/otp,dumbbell/otp,vinoski/otp,vinoski/otp,vinoski/otp,rlipscombe/otp,potatosalad/otp,isvilen/otp,getong/otp,emacsmirror/erlang,erlang/otp,uabboli/otp,potatosalad/otp,emacsmirror/erlang,erlang/otp,mikpe/otp,isvilen/otp,bjorng/otp,rlipscombe/otp,bjorng/otp,rlipscombe/otp,vinoski/otp,g-andrade/otp,uabboli/otp,potatosalad/otp,getong/otp,erlang/otp,g-andrade/otp,getong/otp,uabboli/otp,emacsmirror/erlang,bjorng/otp,vinoski/otp,erlang/otp