Merge "docs: Removed Q preview language and added a link to the Android 10 page on developer.android.com." into rvc-dev am: 6dfedd05a7 am: d015d7299a

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

Change-Id: I8d8d9595a7992196255d09aecac3ace195e15374