Merge "Updated gesture navigation tutorial." into sc-dev am: f126d078ac am: 814532969e am: ad65d28fe1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14537683

Change-Id: Ib3e83cbf4ca5ac4e0ce66cb24aaa960e484bb473