Fix typo in docs (Utils -> Util)
Fix typo in docs (Utils -> Util)

Reported by: Oliver Gaida

erikhuda/thor,segiddins/thor,fhernandez173/thor,linkodehub/thor,doudou/thor,b-dean/thor,flyinbutrs/thor,segiddins/thor,linkodehub/thor,flyinbutrs/thor,groovenauts/thor,groovenauts/thor,b-dean/thor,sideci-sample/sideci-sample-thor,r7kamura/thor,sideci-sample/sideci-sample-thor,r7kamura/thor,fancyremarker/thor,fhernandez173/thor,shaiguitar/thor,fancyremarker/thor