Add is_map_key/2 as a valid guard BIF in the ref doc
Add is_map_key/2 as a valid guard BIF in the ref doc

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