AuthUI.getInstance().signOut() missing 'this'

[frijger]

Browser: Firefox Browser
Browser version: 100.0.2
Operating system: Ubuntu
Operating system version: 20.04.4 LTS

What steps will reproduce the problem:
On this page: https://firebase.google.com/codelabs/firebase-android#5

There is written:
AuthUI.getInstance().signOut():

But it must be:
AuthUI.getInstance().signOut(this)

[BVelaNova]

Thank you so much!