Update config.rb
Update config.rb

Add the documentation for the on_worker_shutdown hook.
arturocadena/puma,tuvistavie/puma,wallclockbuilder/puma,nathansamson/puma,ngpestelos/puma,prathamesh-sonpatki/puma,puma/puma,tuvistavie/puma,zapnap/puma,respire/puma,looker/puma,costi/puma,eileencodes/puma,eileencodes/puma,tuvistavie/puma,BenV/puma,matthewd/puma,zBMNForks/puma,BenV/puma,ngpestelos/puma,unleashed/puma,prathamesh-sonpatki/puma,wallclockbuilder/puma,prathamesh-sonpatki/puma,looker/puma,jc00ke/puma,snow/puma,jc00ke/puma,BenV/puma,zapnap/puma,jbmyid/puma,kyledrake/puma,arturocadena/puma,snow/puma,jbmyid/puma,wallclockbuilder/puma,ngpestelos/puma,eileencodes/puma,snow/puma,jc00ke/puma,puma/puma,zapnap/puma,nathansamson/puma,zBMNForks/puma,ngpestelos/puma,puma/puma,zBMNForks/puma,matthewd/puma,prathamesh-sonpatki/puma,costi/puma,snow/puma,nathansamson/puma,jbmyid/puma,respire/puma,matthewd/puma,zapnap/puma,nathansamson/puma,arturocadena/puma,kyledrake/puma,respire/puma,looker/puma,jbmyid/puma,puma/puma,wallclockbuilder/puma,eileencodes/puma,kyledrake/puma,unleashed/puma,zBMNForks/puma,costi/puma,costi/puma,arturocadena/puma,respire/puma,looker/puma,matthewd/puma,unleashed/puma,jc00ke/puma,unleashed/puma,kyledrake/puma,BenV/puma,tuvistavie/puma