futhark-doc: nicer formating of type specs.
futhark-doc: nicer formating of type specs.

diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark