Fixed outdated log level in docs/topics/logging.txt.
Refs
@@ -377,7 +377,7 @@ This logging configuration does the following things:
* Defines two handlers:
- * ``console``, a StreamHandler, which will print any ``DEBUG``
+ * ``console``, a StreamHandler, which will print any ``INFO``
(or higher) message to stderr. This handler uses the ``simple`` output
format.
