html.streams: fix typo in stack effect for emit-html.
html.streams: fix typo in stack effect for emit-html.

erg/factor,mcandre/factor,erg/factor,mcandre/factor,erg/factor,mcandre/factor,mcandre/factor,mcandre/factor,mcandre/factor,erg/factor,erg/factor,erg/factor,mcandre/factor,erg/factor