changed test comment about nested expressions
changed test comment about nested expressions

rcanepa/diy-lisp,beni55/diy-lisp,joelchelliah/diy-lisp,kjbekkelund/kim-lisp,codecop/diy-lang,fatso83/diy-lisp,couchemar/diy-lisp,kvalle/diy-lisp,kvalle/diy-lang,kvalle/diy-lang,kjbekkelund/kim-lisp,fatso83/diy-lisp,rcanepa/diy-lisp,codecop/diy-lang,joelchelliah/diy-lisp,beni55/diy-lisp,kvalle/diy-lisp,couchemar/diy-lisp