Unify examples for topic guides under experiments.

Author: aaugustin

docs/topics/logging.rst

@@ -146,7 +146,7 @@ output logs as JSON with a bit of effort.
 
 First, we need a :class:`~logging.Formatter` that renders JSON:
 
-.. literalinclude:: ../../example/logging/json_log_formatter.py
+.. literalinclude:: ../../experiments/json_log_formatter.py
 
 Then, we configure logging to apply this formatter::
 

docs/topics/routing.rst

@@ -73,11 +73,11 @@ first argument to declare which URL patterns map to which handlers. Review the
 documentation of :mod:`werkzeug.routing` to learn about its functionality.
 
 To give you a sense of what's possible, here's the URL map of the example in
-`example/routing.py`_:
+`experiments/routing.py`_:
 
-.. _example/routing.py: https://github.com/python-websockets/websockets/blob/main/example/routing.py
+.. _experiments/routing.py: https://github.com/python-websockets/websockets/blob/main/experiments/routing.py
 
-.. literalinclude:: ../../example/routing.py
+.. literalinclude:: ../../experiments/routing.py
     :language: python
     :start-at: url_map = Map(
     :end-at: await server.serve_forever()