Revert "constants docs"
Revert "constants docs"

This reverts commit 84cf58eb4807aa0c57b4cb6245b4edb5d519bacc.

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