Change Addthis loading Placeholder color (#18613)
Change Addthis loading Placeholder color (#18613)

* correct the usage example of amp-addthis extension

* change placeholder color

ampproject/amphtml,zhouyx/amphtml,media-net/amphtml,voyagegroup/amphtml,zhangsu/amphtml,nexxtv/amphtml,laterpay/amphtml,kamtschatka/amphtml,alanorozco/amphtml,widespace-os/amphtml,yandex-pcode/amphtml,mhc-gh/amphtml,alanorozco/amphtml,sebastianbenz/amphtml,laterpay/amphtml,smartadserver/amphtml,nexxtv/amphtml,BenDz/amphtml,koshka/amphtml,Gregable/amphtml,src-code/amphtml,techhtml/amphtml,src-code/amphtml,danielrozenberg/amphtml,taboola/amphtml,Gregable/amphtml,lannka/amphtml,zhangsu/amphtml,lannka/amphtml,prateekbh/amphtml,media-net/amphtml,ampproject/amphtml,yandex-pcode/amphtml,techhtml/amphtml,ampproject/amphtml,erwinmombay/amphtml,techhtml/amphtml,erwinmombay/amphtml,erwinmombay/amphtml,zhouyx/amphtml,voyagegroup/amphtml,cvializ/amphtml,jridgewell/amphtml,mhc-gh/amphtml,tlong2/amphtml,widespace-os/amphtml,pedjoni8/amphtml,src-code/amphtml,dotandads/amphtml,voyagegroup/amphtml,Gregable/amphtml,ampproject/amphtml,BenDz/amphtml,prateekbh/amphtml,zhouyx/amphtml,sebastianbenz/amphtml,BenDz/amphtml,koshka/amphtml,Gregable/amphtml,jridgewell/amphtml,taboola/amphtml,nexxtv/amphtml,Gregable/amphtml,koshka/amphtml,sebastianbenz/amphtml,koshka/amphtml,yandex-pcode/amphtml,smartadserver/amphtml,widespace-os/amphtml,adup-tech/amphtml,jmadler/amphtml,yandex-pcode/amphtml,lannka/amphtml,rsimha-amp/amphtml,sharethrough/amphtml,yieldbot/amphtml,pedjoni8/amphtml,media-net/amphtml,honeybadgerdontcare/amphtml,jpettitt/amphtml,Gregable/amphtml,dotandads/amphtml,yandex-pcode/amphtml,ampproject/amphtml,tlong2/amphtml,cory-work/amphtml,yandex-pcode/amphtml,sebastianbenz/amphtml,cory-work/amphtml,danielrozenberg/amphtml,zhangsu/amphtml,jmadler/amphtml,alanorozco/amphtml,nexxtv/amphtml,mhc-gh/amphtml,jridgewell/amphtml,jpettitt/amphtml,voyagegroup/amphtml,jmadler/amphtml,kamtschatka/amphtml,kamtschatka/amphtml,rsimha-amp/amphtml,laterpay/amphtml,laterpay/amphtml,adup-tech/amphtml,nexxtv/amphtml,rsimha-amp/amphtml,jpettitt/amphtml,rsimha-amp/amphtml,prateekbh/amphtml,kamtschatka/amphtml,yandex-pcode/amphtml,smartadserver/amphtml,lannka/amphtml,mhc-gh/amphtml,zhouyx/amphtml,ampproject/amphtml,widespace-os/amphtml,jpettitt/amphtml,voyagegroup/amphtml,media-net/amphtml,techhtml/amphtml,lannka/amphtml,cvializ/amphtml,honeybadgerdontcare/amphtml,alanorozco/amphtml,erwinmombay/amphtml,jridgewell/amphtml,cvializ/amphtml,danielrozenberg/amphtml,danielrozenberg/amphtml,sebastianbenz/amphtml,mhc-gh/amphtml,src-code/amphtml,smartadserver/amphtml,honeybadgerdontcare/amphtml,koshka/amphtml,jpettitt/amphtml,honeybadgerdontcare/amphtml,jridgewell/amphtml,cory-work/amphtml,laterpay/amphtml,media-net/amphtml,rsimha-amp/amphtml,widespace-os/amphtml,yieldbot/amphtml,danielrozenberg/amphtml,cory-work/amphtml,jpettitt/amphtml,tlong2/amphtml,sharethrough/amphtml,yieldbot/amphtml,Gregable/amphtml,mhc-gh/amphtml,zhangsu/amphtml,ampproject/amphtml,tlong2/amphtml,techhtml/amphtml,BenDz/amphtml,prateekbh/amphtml,pedjoni8/amphtml,taboola/amphtml,BenDz/amphtml,media-net/amphtml,zhangsu/amphtml,jpettitt/amphtml,adup-tech/amphtml,pedjoni8/amphtml,techhtml/amphtml,cvializ/amphtml,smartadserver/amphtml,mhc-gh/amphtml,src-code/amphtml,alanorozco/amphtml,sharethrough/amphtml,widespace-os/amphtml,honeybadgerdontcare/amphtml,taboola/amphtml,cory-work/amphtml,koshka/amphtml,jridgewell/amphtml,yieldbot/amphtml,adup-tech/amphtml,dotandads/amphtml,cvializ/amphtml,yieldbot/amphtml,adup-tech/amphtml,rsimha-amp/amphtml,sharethrough/amphtml,lannka/amphtml,danielrozenberg/amphtml,rsimha-amp/amphtml,dotandads/amphtml,taboola/amphtml,sharethrough/amphtml,kamtschatka/amphtml,prateekbh/amphtml,prateekbh/amphtml,tlong2/amphtml,tlong2/amphtml,zhouyx/amphtml,danielrozenberg/amphtml,ampproject/amphtml,media-net/amphtml,yieldbot/amphtml,alanorozco/amphtml,voyagegroup/amphtml,jridgewell/amphtml,zhangsu/amphtml,jmadler/amphtml,cvializ/amphtml,adup-tech/amphtml,voyagegroup/amphtml,jmadler/amphtml,cory-work/amphtml,mhc-gh/amphtml,src-code/amphtml,pedjoni8/amphtml,laterpay/amphtml,danielrozenberg/amphtml,Gregable/amphtml,lannka/amphtml,taboola/amphtml,smartadserver/amphtml,zhouyx/amphtml,jpettitt/amphtml,cory-work/amphtml,dotandads/amphtml,BenDz/amphtml,alanorozco/amphtml,sharethrough/amphtml,sebastianbenz/amphtml,pedjoni8/amphtml,honeybadgerdontcare/amphtml,dotandads/amphtml,jmadler/amphtml,kamtschatka/amphtml,media-net/amphtml,taboola/amphtml,zhouyx/amphtml,honeybadgerdontcare/amphtml,alanorozco/amphtml,prateekbh/amphtml,nexxtv/amphtml,erwinmombay/amphtml,erwinmombay/amphtml,nexxtv/amphtml