Merge "Updated gesture navigation tutorial." into sc-dev am: f126d078ac am: 7645f27673 am: f5e8218dd5

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

Change-Id: I9c3d213061fb6572460aa5dd82f1bd8af859c2d1