📖 Update comment to Resource.getLayoutBox (#29844)
📖 Update comment to Resource.getLayoutBox (#29844)

* add comment to getLayoutBox

* address comment
Gregable/amphtml,jmadler/amphtml,nexxtv/amphtml,jpettitt/amphtml,ampproject/amphtml,prateekbh/amphtml,smartadserver/amphtml,alanorozco/amphtml,nexxtv/amphtml,jpettitt/amphtml,lannka/amphtml,media-net/amphtml,honeybadgerdontcare/amphtml,alanorozco/amphtml,danielrozenberg/amphtml,alanorozco/amphtml,danielrozenberg/amphtml,sharethrough/amphtml,mhc-gh/amphtml,Gregable/amphtml,danielrozenberg/amphtml,smartadserver/amphtml,rsimha-amp/amphtml,voyagegroup/amphtml,voyagegroup/amphtml,sharethrough/amphtml,jridgewell/amphtml,Gregable/amphtml,ampproject/amphtml,honeybadgerdontcare/amphtml,jmadler/amphtml,mhc-gh/amphtml,voyagegroup/amphtml,jridgewell/amphtml,smartadserver/amphtml,ampproject/amphtml,lannka/amphtml,media-net/amphtml,Gregable/amphtml,prateekbh/amphtml,danielrozenberg/amphtml,alanorozco/amphtml,prateekbh/amphtml,ampproject/amphtml,alanorozco/amphtml,jridgewell/amphtml,sharethrough/amphtml,prateekbh/amphtml,nexxtv/amphtml,Gregable/amphtml,jmadler/amphtml,honeybadgerdontcare/amphtml,nexxtv/amphtml,rsimha-amp/amphtml,rsimha-amp/amphtml,voyagegroup/amphtml,zhouyx/amphtml,media-net/amphtml,voyagegroup/amphtml,rsimha-amp/amphtml,mhc-gh/amphtml,jpettitt/amphtml,honeybadgerdontcare/amphtml,Gregable/amphtml,lannka/amphtml,danielrozenberg/amphtml,prateekbh/amphtml,jpettitt/amphtml,sharethrough/amphtml,Gregable/amphtml,lannka/amphtml,alanorozco/amphtml,media-net/amphtml,jpettitt/amphtml,jridgewell/amphtml,danielrozenberg/amphtml,rsimha-amp/amphtml,jmadler/amphtml,jridgewell/amphtml,Gregable/amphtml,danielrozenberg/amphtml,zhouyx/amphtml,jpettitt/amphtml,media-net/amphtml,honeybadgerdontcare/amphtml,nexxtv/amphtml,sharethrough/amphtml,media-net/amphtml,smartadserver/amphtml,smartadserver/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,lannka/amphtml,nexxtv/amphtml,lannka/amphtml,ampproject/amphtml,jridgewell/amphtml,ampproject/amphtml,media-net/amphtml,mhc-gh/amphtml,voyagegroup/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,media-net/amphtml,prateekbh/amphtml,jmadler/amphtml,smartadserver/amphtml,jridgewell/amphtml,zhouyx/amphtml,mhc-gh/amphtml,alanorozco/amphtml,mhc-gh/amphtml,zhouyx/amphtml,danielrozenberg/amphtml,alanorozco/amphtml,honeybadgerdontcare/amphtml,lannka/amphtml,zhouyx/amphtml,zhouyx/amphtml,sharethrough/amphtml,ampproject/amphtml,prateekbh/amphtml,zhouyx/amphtml,jmadler/amphtml,voyagegroup/amphtml,jpettitt/amphtml,jpettitt/amphtml,nexxtv/amphtml,ampproject/amphtml,honeybadgerdontcare/amphtml