Update rtc docs with list of supported vendors. (#19453)
Update rtc docs with list of supported vendors. (#19453)


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