Closes #18933: Merged update from 3.3.

Doc/library/logging.config.rst

@@ -17,6 +17,10 @@
    * :ref:`Advanced Tutorial <logging-advanced-tutorial>`
    * :ref:`Logging Cookbook <logging-cookbook>`
 
+**Source code:** :source:`Lib/logging/config.py`
+
+--------------
+
 This section describes the API for configuring the logging module.
 
 .. _logging-config-api:

Doc/library/logging.handlers.rst

@@ -17,6 +17,10 @@
    * :ref:`Advanced Tutorial <logging-advanced-tutorial>`
    * :ref:`Logging Cookbook <logging-cookbook>`
 
+**Source code:** :source:`Lib/logging/handlers.py`
+
+--------------
+
 .. currentmodule:: logging
 
 The following useful handlers are provided in the package. Note that three of

Doc/library/logging.rst

@@ -21,6 +21,10 @@
    * :ref:`Logging Cookbook <logging-cookbook>`
 
 
+**Source code:** :source:`Lib/logging/__init__.py`
+
+--------------
+
 This module defines functions and classes which implement a flexible event
 logging system for applications and libraries.