bpo-32822: Add finally with return/break/continue to the tutorial (GH-25600) (#25893)

This documents in the tutorial docs the behavior of a finally clause in
case it should re-raise an exception but contains a
return/break/continue statement.
(cherry picked from commit a0b9915a8be98427432e13d8eb2207a8b9824179)

Co-authored-by: Roberto Hueso <robertohueso96@gmail.com>