docs: fix ktx docs urls for firebaseopensource.com (#325)
docs: fix ktx docs urls for firebaseopensource.com (#325)


firebase/firebase-android-sdk,firebase/firebase-android-sdk,firebase/firebase-android-sdk,firebase/firebase-android-sdk,firebase/firebase-android-sdk,firebase/firebase-android-sdk,firebase/firebase-android-sdk,firebase/firebase-android-sdk