update Procfile.dev comments
update Procfile.dev comments

chenwenbin928/classroom,jingruoruchu/classroom,alejandrogarciasalas/classroom,chengjunjian/classroom,ConnorCartwright/classroom,adoosii/classroom,adoosii/classroom,bhanuc/classroom,bhanuc/classroom,tjhorner/classroom,BelieveC/classroom,RyanTech/classroom,tjhorner/classroom,hackerkid/classroom,chenwenbin928/classroom,adoosii/classroom,nfeliciano/classroom,hackerkid/classroom,chengjunjian/classroom,jingruoruchu/classroom,mostlybadfly/classroom,jasnow/classroom,jasnow/classroom,mostlybadfly/classroom,chenwenbin928/classroom,BelieveC/classroom,BelieveC/classroom,hackerkid/classroom,nfeliciano/classroom,alejandrogarciasalas/classroom,guoyu07/classroom,RyanTech/classroom,mkcode/classroom,jingruoruchu/classroom,guoyu07/classroom,guoyu07/classroom,alejandrogarciasalas/classroom,nfeliciano/classroom,mkcode/classroom,ConnorCartwright/classroom,bhanuc/classroom,ConnorCartwright/classroom,BelieveC/classroom,chengjunjian/classroom,jasnow/classroom,tjhorner/classroom,mkcode/classroom,RyanTech/classroom,mostlybadfly/classroom