[3.13] gh-138297 Point link in docs for `finally` to try/else, instead of if/else (GH-138298) (#138382)

Co-authored-by: James Parrott <80779630+JamesParrott@users.noreply.github.com>
Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>
Co-authored-by: Adam Turner <9087854+aa-turner@users.noreply.github.com>