Update tips.rst
Update tips.rst

add 404 page instructions for amazon s3.

rbarraud/pelican,abrahamvarricatt/pelican,garbas/pelican,kennethlyn/pelican,getpelican/pelican,jvehent/pelican,treyhunner/pelican,GiovanniMoretti/pelican,levanhien8/pelican,HyperGroups/pelican,farseerfc/pelican,Summonee/pelican,Summonee/pelican,kennethlyn/pelican,ehashman/pelican,ingwinlu/pelican,eevee/pelican,ls2uper/pelican,jimperio/pelican,zackw/pelican,HyperGroups/pelican,gymglish/pelican,getpelican/pelican,iKevinY/pelican,treyhunner/pelican,TC01/pelican,iKevinY/pelican,51itclub/pelican,number5/pelican,deved69/pelican-1,gymglish/pelican,lucasplus/pelican,avaris/pelican,koobs/pelican,simonjj/pelican,garbas/pelican,51itclub/pelican,lucasplus/pelican,JeremyMorgan/pelican,TC01/pelican,rbarraud/pelican,abrahamvarricatt/pelican,Scheirle/pelican,ehashman/pelican,douglaskastle/pelican,simonjj/pelican,catdog2/pelican,karlcow/pelican,deanishe/pelican,Polyconseil/pelican,Rogdham/pelican,florianjacob/pelican,ehashman/pelican,Scheirle/pelican,talha131/pelican,GiovanniMoretti/pelican,farseerfc/pelican,koobs/pelican,lazycoder-ru/pelican,garbas/pelican,catdog2/pelican,lazycoder-ru/pelican,number5/pelican,Scheirle/pelican,levanhien8/pelican,jimperio/pelican,jimperio/pelican,Rogdham/pelican,UdeskDeveloper/pelican,catdog2/pelican,joetboole/pelican,abrahamvarricatt/pelican,douglaskastle/pelican,ls2uper/pelican,florianjacob/pelican,ingwinlu/pelican,avaris/pelican,JeremyMorgan/pelican,zackw/pelican,deved69/pelican-1,talha131/pelican,eevee/pelican,joetboole/pelican,levanhien8/pelican,rbarraud/pelican,UdeskDeveloper/pelican,deved69/pelican-1,florianjacob/pelican,treyhunner/pelican,jvehent/pelican,gymglish/pelican,JeremyMorgan/pelican,karlcow/pelican,joetboole/pelican,Polyconseil/pelican,deanishe/pelican,51itclub/pelican,deanishe/pelican,zackw/pelican,number5/pelican,simonjj/pelican,kennethlyn/pelican,UdeskDeveloper/pelican,lucasplus/pelican,lazycoder-ru/pelican,TC01/pelican,Rogdham/pelican,GiovanniMoretti/pelican,eevee/pelican,HyperGroups/pelican,karlcow/pelican,koobs/pelican,douglaskastle/pelican,ls2uper/pelican,Summonee/pelican,jvehent/pelican