doc: clean up asyncworker.md
doc: clean up asyncworker.md

thefourtheye/nan,Jonekee/nan,LinusU/nan,gagern/nan,guymguym/nan,noahjs/nan,hmalphettes/nan,mscdex/nan,eljefedelrodeodeljefe/nan,thejinx0r/nan,ipmobiletech/nan,guymguym/nan,thefourtheye/nan,durai145/nan,noahjs/nan,sesh-kebab/nan,LinusU/nan,ipmobiletech/nan,hmalphettes/nan,eljefedelrodeodeljefe/nan,evanlucas/nan,mscdex/nan,mscdex/nan,lovell/nan,sesh-kebab/nan,Jonekee/nan,mikolalysenko/nan,eljefedelrodeodeljefe/nan,nodejs/nan,mscdex/nan,thejinx0r/nan,gagern/nan,mikolalysenko/nan,guymguym/nan,addaleax/nan,sanemat/nan,nodejs/nan,Jonekee/nan,thefourtheye/nan,fleg/nan,nodejs/nan,LinusU/nan,addaleax/nan,thejinx0r/nan,saper/nan,fleg/nan,durai145/nan,evanlucas/nan,sanemat/nan,addaleax/nan,fleg/nan,nodejs/nan,durai145/nan,ipmobiletech/nan,saper/nan,durai145/nan,sesh-kebab/nan,evanlucas/nan,mikolalysenko/nan,addaleax/nan,eljefedelrodeodeljefe/nan,ipmobiletech/nan,hmalphettes/nan,Jonekee/nan,thefourtheye/nan,sanemat/nan,sanemat/nan,thejinx0r/nan,mikolalysenko/nan,hmalphettes/nan,guymguym/nan,noahjs/nan,LinusU/nan,gagern/nan,lovell/nan,saper/nan,evanlucas/nan,fleg/nan,saper/nan,sesh-kebab/nan,noahjs/nan,lovell/nan,lovell/nan