Sticky ad behavior changes (#8336)
Sticky ad behavior changes (#8336)

- Remove item about how sticky ad will only load after 1 viewport is scrolled (no longer true)
- Add item to reflect that container collapses if no ad is filled
laterpay/amphtml,yieldbot/amphtml,zhouyx/amphtml,dotandads/amphtml,kamtschatka/amphtml,koshka/amphtml,engtat/amphtml,yieldmo/amphtml,laterpay/amphtml,jmadler/amphtml,zhangsu/amphtml,honeybadgerdontcare/amphtml,luciancrasovan/amphtml,tlong2/amphtml,BenDz/amphtml,Gregable/amphtml,clawr/amphtml,engtat/amphtml,fullspeed-sp/amphtml,camelburrito/amphtml,chaveznvg/amphtml,rajkumarsrk/amphtml,Gregable/amphtml,yandex-pcode/amphtml,vmarteev/amphtml,Mobusi-ads/amphtml,kixer-com/amphtml,ADITION/amphtml,kixer-com/amphtml,sriramkrish85/amphtml,engtat/amphtml,mhc-gh/amphtml,yieldbot/amphtml,erwinmombay/amphtml,techhtml/amphtml,aghassemi/amphtml,alanorozco/amphtml,donttrustthisbot/amphtml,powdercloud/amphtml,adup-tech/amphtml,honeybadgerdontcare/amphtml,bpaduch/amphtml,kmh287/amphtml,bpaduch/amphtml,Mobusi-ads/amphtml,alanorozco/amphtml,wjfang/amphtml,fullspeed-sp/amphtml,cvializ/amphtml,cory-work/amphtml,lannka/amphtml,rsimha-amp/amphtml,clawr/amphtml,Gregable/amphtml,pedjoni8/amphtml,shawnbuso/amphtml,adiant/amphtml,shawnbuso/amphtml,Mobusi-ads/amphtml,luciancrasovan/amphtml,jmadler/amphtml,zhouyx/amphtml,lzanol/amphtml,rsimha-amp/amphtml,techhtml/amphtml,yandex-pcode/amphtml,sharethrough/amphtml,camelburrito/amphtml,comScore/amphtml,adup-tech/amphtml,arealit/amphtml,arealit/amphtml,taboola/amphtml,DAC-f1h-dev/amphtml,nexxtv/amphtml,engtat/amphtml,sharethrough/amphtml,vmarteev/amphtml,danielrozenberg/amphtml,rsimha-amp/amphtml,cory-work/amphtml,danielrozenberg/amphtml,spotxchange/amphtml,shawnbuso/amphtml,alanorozco/amphtml,burtcorp/amphtml,adup-tech/amphtml,src-code/amphtml,zhucl/amphtml,luciancrasovan/amphtml,zhucl/amphtml,zhangsu/amphtml,ADITION/amphtml,kmh287/amphtml,smartadserver/amphtml,jpettitt/amphtml,adup-tech/amphtml,arealit/amphtml,erwinmombay/amphtml,bpaduch/amphtml,donttrustthisbot/amphtml,media-net/amphtml,koshka/amphtml,ampproject/amphtml,jridgewell/amphtml,DarXector/amphtml,src-code/amphtml,voyagegroup/amphtml,JuliusThms/amphtml,techhtml/amphtml,sriramkrish85/amphtml,yieldbot/amphtml,arealit/amphtml,cory-work/amphtml,zhucl/amphtml,aghassemi/amphtml,prateekbh/amphtml,keithwrightbos/amphtml,nexxtv/amphtml,koshka/amphtml,widespace-os/amphtml,keithwrightbos/amphtml,danielrozenberg/amphtml,cvializ/amphtml,tlong2/amphtml,pedjoni8/amphtml,sklobovskaya/amphtml,wjfang/amphtml,ampproject/amphtml,src-code/amphtml,zhouyx/amphtml,mhc-gh/amphtml,honeybadgerdontcare/amphtml,ampproject/amphtml,widespace-os/amphtml,alanorozco/amphtml,gumgum/amphtml,donttrustthisbot/amphtml,sharethrough/amphtml,comScore/amphtml,media-net/amphtml,sklobovskaya/amphtml,JuliusThms/amphtml,arealit/amphtml,mhc-gh/amphtml,powdercloud/amphtml,rajkumarsrk/amphtml,DarXector/amphtml,burtcorp/amphtml,src-code/amphtml,sebastianbenz/amphtml,sebastianbenz/amphtml,mhc-gh/amphtml,jridgewell/amphtml,lannka/amphtml,ecoron/amphtml,clawr/amphtml,powdercloud/amphtml,lzanol/amphtml,clawr/amphtml,media-net/amphtml,media-net/amphtml,vmarteev/amphtml,jpettitt/amphtml,cvializ/amphtml,adiant/amphtml,prateekbh/amphtml,alanorozco/amphtml,jpettitt/amphtml,taboola/amphtml,wjfang/amphtml,Mobusi-ads/amphtml,sebastianbenz/amphtml,bpaduch/amphtml,prateekbh/amphtml,jdelhommeau/amphtml,chaveznvg/amphtml,widespace-os/amphtml,donttrustthisbot/amphtml,avimehta/amphtml,DAC-f1h-dev/amphtml,taboola/amphtml,ecoron/amphtml,erwinmombay/amphtml,yieldbot/amphtml,wjfang/amphtml,fullspeed-sp/amphtml,ADITION/amphtml,gumgum/amphtml,nexxtv/amphtml,smartadserver/amphtml,gumgum/amphtml,arealit/amphtml,ecoron/amphtml,media-net/amphtml,kamtschatka/amphtml,voyagegroup/amphtml,jdelhommeau/amphtml,rajkumarsrk/amphtml,DAC-f1h-dev/amphtml,techhtml/amphtml,rajkumarsrk/amphtml,pedjoni8/amphtml,yandex-pcode/amphtml,avimehta/amphtml,taboola/amphtml,avimehta/amphtml,lzanol/amphtml,mhc-gh/amphtml,luciancrasovan/amphtml,rsimha-amp/amphtml,pedjoni8/amphtml,gumgum/amphtml,shawnbuso/amphtml,keithwrightbos/amphtml,widespace-os/amphtml,ampproject/amphtml,powdercloud/amphtml,kixer-com/amphtml,smartadserver/amphtml,comScore/amphtml,lzanol/amphtml,fullspeed-sp/amphtml,shawnbuso/amphtml,camelburrito/amphtml,keithwrightbos/amphtml,gumgum/amphtml,camelburrito/amphtml,smartadserver/amphtml,rajkumarsrk/amphtml,taboola/amphtml,donttrustthisbot/amphtml,chaveznvg/amphtml,shawnbuso/amphtml,jpettitt/amphtml,yandex-pcode/amphtml,yieldmo/amphtml,zhouyx/amphtml,yieldmo/amphtml,kamtschatka/amphtml,adiant/amphtml,koshka/amphtml,jdelhommeau/amphtml,yieldbot/amphtml,zhouyx/amphtml,danielrozenberg/amphtml,DarXector/amphtml,shawnbuso/amphtml,camelburrito/amphtml,erwinmombay/amphtml,sklobovskaya/amphtml,wjfang/amphtml,sebastianbenz/amphtml,donttrustthisbot/amphtml,laterpay/amphtml,clawr/amphtml,cvializ/amphtml,nexxtv/amphtml,koshka/amphtml,yieldmo/amphtml,prateekbh/amphtml,mhc-gh/amphtml,BenDz/amphtml,media-net/amphtml,mhc-gh/amphtml,sriramkrish85/amphtml,engtat/amphtml,bpaduch/amphtml,JuliusThms/amphtml,kmh287/amphtml,luciancrasovan/amphtml,jridgewell/amphtml,lannka/amphtml,BenDz/amphtml,keithwrightbos/amphtml,pedjoni8/amphtml,taboola/amphtml,src-code/amphtml,DarXector/amphtml,cory-work/amphtml,aghassemi/amphtml,vmarteev/amphtml,comScore/amphtml,yieldmo/amphtml,powdercloud/amphtml,zhangsu/amphtml,kmh287/amphtml,cory-work/amphtml,aghassemi/amphtml,yandex-pcode/amphtml,laterpay/amphtml,sharethrough/amphtml,lzanol/amphtml,kixer-com/amphtml,comScore/amphtml,techhtml/amphtml,ecoron/amphtml,tlong2/amphtml,prateekbh/amphtml,rsimha-amp/amphtml,aghassemi/amphtml,rajkumarsrk/amphtml,prateekbh/amphtml,zhucl/amphtml,jdelhommeau/amphtml,wjfang/amphtml,ADITION/amphtml,prateekbh/amphtml,voyagegroup/amphtml,JuliusThms/amphtml,honeybadgerdontcare/amphtml,donttrustthisbot/amphtml,lzanol/amphtml,zhouyx/amphtml,spotxchange/amphtml,avimehta/amphtml,powdercloud/amphtml,BenDz/amphtml,voyagegroup/amphtml,camelburrito/amphtml,zhangsu/amphtml,cvializ/amphtml,lannka/amphtml,nexxtv/amphtml,honeybadgerdontcare/amphtml,jmadler/amphtml,spotxchange/amphtml,luciancrasovan/amphtml,yandex-pcode/amphtml,clawr/amphtml,camelburrito/amphtml,techhtml/amphtml,rsimha-amp/amphtml,jmadler/amphtml,smartadserver/amphtml,Gregable/amphtml,danielrozenberg/amphtml,zhouyx/amphtml,lannka/amphtml,avimehta/amphtml,spotxchange/amphtml,JuliusThms/amphtml,rsimha-amp/amphtml,alanorozco/amphtml,cvializ/amphtml,src-code/amphtml,jridgewell/amphtml,mhc-gh/amphtml,vmarteev/amphtml,yieldbot/amphtml,burtcorp/amphtml,kmh287/amphtml,jridgewell/amphtml,ecoron/amphtml,erwinmombay/amphtml,dotandads/amphtml,alanorozco/amphtml,jpettitt/amphtml,jpettitt/amphtml,luciancrasovan/amphtml,engtat/amphtml,adiant/amphtml,burtcorp/amphtml,DarXector/amphtml,media-net/amphtml,tlong2/amphtml,Gregable/amphtml,jdelhommeau/amphtml,yandex-pcode/amphtml,sriramkrish85/amphtml,tlong2/amphtml,adiant/amphtml,powdercloud/amphtml,dotandads/amphtml,nexxtv/amphtml,jridgewell/amphtml,spotxchange/amphtml,kixer-com/amphtml,erwinmombay/amphtml,dotandads/amphtml,clawr/amphtml,sklobovskaya/amphtml,keithwrightbos/amphtml,danielrozenberg/amphtml,vmarteev/amphtml,gumgum/amphtml,tlong2/amphtml,spotxchange/amphtml,jmadler/amphtml,koshka/amphtml,chaveznvg/amphtml,ampproject/amphtml,lannka/amphtml,keithwrightbos/amphtml,dotandads/amphtml,cory-work/amphtml,kamtschatka/amphtml,ecoron/amphtml,nexxtv/amphtml,widespace-os/amphtml,ampproject/amphtml,sriramkrish85/amphtml,gumgum/amphtml,smartadserver/amphtml,wjfang/amphtml,vmarteev/amphtml,jpettitt/amphtml,jpettitt/amphtml,Gregable/amphtml,yieldmo/amphtml,yieldmo/amphtml,engtat/amphtml,zhucl/amphtml,burtcorp/amphtml,sklobovskaya/amphtml,bpaduch/amphtml,danielrozenberg/amphtml,kmh287/amphtml,adup-tech/amphtml,fullspeed-sp/amphtml,fullspeed-sp/amphtml,sklobovskaya/amphtml,kixer-com/amphtml,BenDz/amphtml,honeybadgerdontcare/amphtml,kamtschatka/amphtml,adiant/amphtml,kamtschatka/amphtml,dotandads/amphtml,laterpay/amphtml,bpaduch/amphtml,comScore/amphtml,jridgewell/amphtml,chaveznvg/amphtml,DAC-f1h-dev/amphtml,DAC-f1h-dev/amphtml,burtcorp/amphtml,sklobovskaya/amphtml,ampproject/amphtml,Mobusi-ads/amphtml,Gregable/amphtml,DarXector/amphtml,adup-tech/amphtml,BenDz/amphtml,aghassemi/amphtml,zhucl/amphtml,adiant/amphtml,jmadler/amphtml,zhangsu/amphtml,pedjoni8/amphtml,Mobusi-ads/amphtml,voyagegroup/amphtml,honeybadgerdontcare/amphtml,sharethrough/amphtml,avimehta/amphtml,widespace-os/amphtml,Gregable/amphtml,rajkumarsrk/amphtml,comScore/amphtml,arealit/amphtml,DAC-f1h-dev/amphtml,media-net/amphtml,sriramkrish85/amphtml,alanorozco/amphtml,ADITION/amphtml,cory-work/amphtml,lannka/amphtml,kixer-com/amphtml,danielrozenberg/amphtml,chaveznvg/amphtml,taboola/amphtml,sebastianbenz/amphtml,zhangsu/amphtml,jdelhommeau/amphtml,ampproject/amphtml,laterpay/amphtml,voyagegroup/amphtml,voyagegroup/amphtml,sharethrough/amphtml,zhucl/amphtml,JuliusThms/amphtml,sebastianbenz/amphtml