SmooshGate: update article per resolution (#6182)
SmooshGate: update article per resolution (#6182)

`flatten` was renamed into `flat`.
sonyarianto/WebFundamentals,lucab85/WebFundamentals,samdutton/WebFundamentals,agektmr/WebFundamentals,agektmr/WebFundamentals,myakura/WebFundamentals,sonyarianto/WebFundamentals,lucab85/WebFundamentals,google/WebFundamentals,samdutton/WebFundamentals,sonyarianto/WebFundamentals,myakura/WebFundamentals,myakura/WebFundamentals,samdutton/WebFundamentals,samdutton/WebFundamentals,google/WebFundamentals,agektmr/WebFundamentals,google/WebFundamentals,ebidel/WebFundamentals,ebidel/WebFundamentals,ebidel/WebFundamentals,lucab85/WebFundamentals,sonyarianto/WebFundamentals,lucab85/WebFundamentals,agektmr/WebFundamentals,myakura/WebFundamentals,google/WebFundamentals,ebidel/WebFundamentals