[3.12] gh-126664: Use `else` instead of `finally` in "The with statement" documentation. (GH-126665) (#126671)

gh-126664: Use `else` instead of `finally` in "The with statement" documentation. (GH-126665)
(cherry picked from commit 25257d61cfccc3b4189f96390a5c4db73fd5302c)

Co-authored-by: vivodi <103735539+vivodi@users.noreply.github.com>