[Proposal] Simplified Lua Reference

["Soni \"They/Them\" L." <fakedme@...>]

The Lua reference manual includes things like BNF everywhere and some
stuff like "they can be used to represent ordinary arrays, lists, symbol
tables, sets, records, graphs, trees, etc."

It seems like a good idea to have a reference manual that translates the
BNF to english in a way that's easy for someone who doesn't know
programming to understand, and maybe omits things like the above, as
they add unnecessary complexity.

And arguably the stuff like "they can be used to represent ordinary
arrays, lists, symbol tables, sets, records, graphs, trees, etc." isn't
a good fit for a reference manual anyway, but mainly this is about the BNF.