Make write documentation a bit clearer.
Make write documentation a bit clearer.

diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,ihc/futhark,diku-dk/futhark,mrakgr/futhark,ihc/futhark,CulpaBS/wbBach,ihc/futhark,HIPERFIT/futhark,mrakgr/futhark,HIPERFIT/futhark,mrakgr/futhark,diku-dk/futhark,diku-dk/futhark