This change updates the feedback shown to users to align with the
strings in figma for the back gesture tutorial.
Fix: 300919987
Test: Went through both the redesigned and previous gesture tutorial and
ensured the updated strings show up in the redesigned tutorial.
Flag: LEGACY ENABLE_NEW_GESTURE_NAV_TUTORIAL ENABLED
Change-Id: I057af6e8631b86ffaec8093ffbfbeae01c9d917c