Merge "docs: Removed Q preview language and added a link to the Android 10 page on developer.android.com." into rvc-dev am: 6dfedd05a7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12347462

Change-Id: I7bd9a90e3b66e4a842bdcaa33f62328fd9928af7