[3.14] gh-127313: Use getLogger() without argument to get root logger in logging cookbook (GH-143683) (GH-144431)

gh-127313: Use getLogger() without argument to get root logger in logging cookbook (GH-143683)

Use getLogger() to get root logger in logging cookbook
(cherry picked from commit 53fecbe6e116a4426058b7d0f6c451719c72cb5b)

Co-authored-by: AN Long <aisk@users.noreply.github.com>