engine: removed obsolete docstring and simplified next_request method
engine: removed obsolete docstring and simplified next_request method

Adai0808/scrapy-1,famorted/scrapy,Chenmxs/scrapy,sigma-random/scrapy,bmess/scrapy,hyrole/scrapy,YeelerG/scrapy,barraponto/scrapy,cyrixhero/scrapy,pawelmhm/scrapy,pombredanne/scrapy,elacuesta/scrapy,Slater-Victoroff/scrapy,shaform/scrapy,Djlavoy/scrapy,tliber/scrapy,darkrho/scrapy-scrapy,arush0311/scrapy,darkrho/scrapy-scrapy,Chenmxs/scrapy,csalazar/scrapy,legendtkl/scrapy,jiezhu2007/scrapy,livepy/scrapy,coderabhishek/scrapy,Partoo/scrapy,huoxudong125/scrapy,redapple/scrapy,devGregA/scrapy,URXtech/scrapy,famorted/scrapy,jc0n/scrapy,profjrr/scrapy,CodeJuan/scrapy,Cnfc19932/scrapy,jeffreyjinfeng/scrapy,ssteo/scrapy,kazitanvirahsan/scrapy,moraesnicol/scrapy,GregoryVigoTorres/scrapy,tagatac/scrapy,devGregA/scrapy,Digenis/scrapy,ramiro/scrapy,hectoruelo/scrapy,zjuwangg/scrapy,1yvT0s/scrapy,sardok/scrapy,heamon7/scrapy,beni55/scrapy,nowopen/scrapy,hwsyy/scrapy,raphaelfruneaux/scrapy,snowdream1314/scrapy,hbwzhsh/scrapy,olorz/scrapy,dacjames/scrapy,emschorsch/scrapy,emschorsch/scrapy,dracony/scrapy,eliasdorneles/scrapy,taito/scrapy,rolando/scrapy,hectoruelo/scrapy,farhan0581/scrapy,zorojean/scrapy,dgillis/scrapy,rklabs/scrapy,huoxudong125/scrapy,ssh-odoo/scrapy,WilliamKinaan/scrapy,finfish/scrapy,hwsyy/scrapy,IvanGavran/scrapy,zjuwangg/scrapy,kazitanvirahsan/scrapy,kashyap32/scrapy,starrify/scrapy,taito/scrapy,w495/scrapy,CodeJuan/scrapy,Parlin-Galanodel/scrapy,eliasdorneles/scrapy,gnemoug/scrapy,kalessin/scrapy,haiiiiiyun/scrapy,curita/scrapy,zjuwangg/scrapy,beni55/scrapy,nikgr95/scrapy,agusc/scrapy,jamesblunt/scrapy,zorojean/scrapy,kalessin/scrapy,zackslash/scrapy,z-fork/scrapy,tagatac/scrapy,wangjun/scrapy,raphaelfruneaux/scrapy,dgillis/scrapy,gbirke/scrapy,ArturGaspar/scrapy,cleydson/scrapy,agreen/scrapy,dhenyjarasandy/scrapy,mlyundin/scrapy,AaronTao1990/scrapy,Preetwinder/scrapy,GregoryVigoTorres/scrapy,olafdietsche/scrapy,profjrr/scrapy,IvanGavran/scrapy,nfunato/scrapy,wangjun/scrapy,hectoruelo/scrapy,mgedmin/scrapy,bmess/scrapy,dangra/scrapy,ArturGaspar/scrapy,Geeglee/scrapy,avtoritet/scrapy,emschorsch/scrapy,xiao26/scrapy,Zephor5/scrapy,avtoritet/scrapy,Timeship/scrapy,liyy7/scrapy,webmakin/scrapy,kimimj/scrapy,Geeglee/scrapy,codebhendi/scrapy,fqul/scrapy,cyrixhero/scrapy,ENjOyAbLE1991/scrapy,foromer4/scrapy,yusofm/scrapy,bmess/scrapy,Bourneer/scrapy,Partoo/scrapy,nfunato/scrapy,redapple/scrapy,Bourneer/scrapy,rolando-contrib/scrapy,AaronTao1990/scrapy,fontenele/scrapy,wenyu1001/scrapy,wenyu1001/scrapy,foromer4/scrapy,yidongliu/scrapy,cursesun/scrapy,ssh-odoo/scrapy,tntC4stl3/scrapy,moraesnicol/scrapy,nikgr95/scrapy,nguyenhongson03/scrapy,cursesun/scrapy,agusc/scrapy,Allianzcortex/scrapy,jamesblunt/scrapy,heamon7/scrapy,Ryezhang/scrapy,farhan0581/scrapy,wzyuliyang/scrapy,JacobStevenR/scrapy,heamon7/scrapy,github-account-because-they-want-it/scrapy,ylcolala/scrapy,livepy/scrapy,Preetwinder/scrapy,arush0311/scrapy,shaform/scrapy,ramiro/scrapy,webmakin/scrapy,pranjalpatil/scrapy,redapple/scrapy,Parlin-Galanodel/scrapy,kazitanvirahsan/scrapy,eLRuLL/scrapy,snowdream1314/scrapy,pranjalpatil/scrapy,elijah513/scrapy,nett55/scrapy,Lucifer-Kim/scrapy,JacobStevenR/scrapy,smaty1/scrapy,umrashrf/scrapy,liyy7/scrapy,rklabs/scrapy,arush0311/scrapy,CENDARI/scrapy,starrify/scrapy,finfish/scrapy,mgedmin/scrapy,stenskjaer/scrapy,pfctdayelise/scrapy,codebhendi/scrapy,tliber/scrapy,Partoo/scrapy,rklabs/scrapy,haiiiiiyun/scrapy,olafdietsche/scrapy,sardok/scrapy,Djlavoy/scrapy,AaronTao1990/scrapy,Allianzcortex/scrapy,legendtkl/scrapy,KublaikhanGeek/scrapy,ylcolala/scrapy,raphaelfruneaux/scrapy,snowdream1314/scrapy,kmike/scrapy,csalazar/scrapy,Bourneer/scrapy,mgedmin/scrapy,jc0n/scrapy,starrify/scrapy,nguyenhongson03/scrapy,fpy171/scrapy,dacjames/scrapy,ndemir/scrapy,dhenyjarasandy/scrapy,zhangtao11/scrapy,umrashrf/scrapy,URXtech/scrapy,WilliamKinaan/scrapy,stenskjaer/scrapy,mouadino/scrapy,KublaikhanGeek/scrapy,hansenDise/scrapy,Slater-Victoroff/scrapy,pablohoffman/scrapy,kimimj/scrapy,haiiiiiyun/scrapy,yarikoptic/scrapy,carlosp420/scrapy,smaty1/scrapy,darkrho/scrapy-scrapy,joshlk/scrapy,codebhendi/scrapy,umrashrf/scrapy,1yvT0s/scrapy,finfish/scrapy,webmakin/scrapy,yusofm/scrapy,elacuesta/scrapy,moraesnicol/scrapy,ssteo/scrapy,wujuguang/scrapy,URXtech/scrapy,TarasRudnyk/scrapy,legendtkl/scrapy,stenskjaer/scrapy,fqul/scrapy,OpenWhere/scrapy,jdemaeyer/scrapy,smaty1/scrapy,cursesun/scrapy,zhangtao11/scrapy,hwsyy/scrapy,amboxer21/scrapy,z-fork/scrapy,w495/scrapy,scorphus/scrapy,zackslash/scrapy,sigma-random/scrapy,gnemoug/scrapy,kmike/scrapy,rdowinton/scrapy,hyrole/scrapy,dracony/scrapy,Timeship/scrapy,shaform/scrapy,chekunkov/scrapy,irwinlove/scrapy,ArturGaspar/scrapy,beni55/scrapy,Digenis/scrapy,xiao26/scrapy,coderabhishek/scrapy,pablohoffman/scrapy,nowopen/scrapy,lacrazyboy/scrapy,fpy171/scrapy,irwinlove/scrapy,wujuguang/scrapy,foromer4/scrapy,olorz/scrapy,agusc/scrapy,hansenDise/scrapy,TarasRudnyk/scrapy,jdemaeyer/scrapy,lacrazyboy/scrapy,rahulsharma1991/scrapy,taito/scrapy,dhenyjarasandy/scrapy,scorphus/scrapy,dacjames/scrapy,faf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