Why Android Studio's quick documentation show links instead of correct content?

Question

Why my Android Studio's quick documentation show links instead of correct content?

My Gradle: com.google.android.gms:play-services-location:17.0.0@aar

My Android Studio:

But tutorial's video can show quick documentation correct content,Why?

Video's gradle: Gradle: com.google.android.gms:play-services-location:18.0.0@aar

user_13482100 · Answer

plugins {
    id 'idea'
}
idea {
    module {
        downloadJavadoc = true
    }
}