Fix misindented yaml in logging how to example (GH-8604)

(cherry picked from commit 10b59f1b019cd00c940dd7f4a74c4f667a20f25f)

Co-authored-by: Rémy HUBSCHER <hubscher.remy@gmail.com>
diff --git a/Doc/howto/logging.rst b/Doc/howto/logging.rst
index 47b5c68..6f47bae 100644
--- a/Doc/howto/logging.rst
+++ b/Doc/howto/logging.rst
@@ -750,9 +750,9 @@
         level: DEBUG
         handlers: [console]
         propagate: no
-    root:
-      level: DEBUG
-      handlers: [console]
+      root:
+        level: DEBUG
+        handlers: [console]
 
 For more information about logging using a dictionary, see
 :ref:`logging-config-api`.