Merge "Update gesture navigation tutorial." into sc-dev am: 53a44a2e51 am: db7e4ed81c am: 50793d7000

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14341983

Change-Id: I50ba9a7525c5439d231870c4db279f9550a5d191