Highlight multiret

[inferrna]

Fix this

to this

Also updated list of builtins to highlight with

lobster  --gen-builtins-json | jq  'map(.funcname)' - | awk '$1 ~ " *\"" {gsub(",", ""); print $1"|"}'|sort|uniq | xargs| tr -d \ 

so it became

@ewoudje behold it please

[aardappel]

This LGTM