Note queuing default change in changelog (#7314)

Author: gjoseph92

docs/source/changelog.rst

@@ -6,6 +6,16 @@ Changelog
 
 Released on November 15, 2022
 
+.. note::
+
+    This release changes the default scheduling mode to use :ref:`queuing <queuing>`.
+    This will significantly reduce cluster memory use in most cases, and generally
+    improve stability and performance. `Learn more here <https://www.coiled.io/blog/reducing-dask-memory-usage>`_
+    and please provide any feedback `on this discussion <https://github.com/dask/distributed/discussions/7128>`_.
+
+    In rare cases, this could make some workloads slower. See the :ref:`documentation <adjust-queuing>`
+    for more information, and how to switch back to the old mode.
+
 New Features
 ^^^^^^^^^^^^
 - Add ``ForwardOutput`` worker plugin to forward ``stdout`` and ``stderr`` to client. (:pr:`7297`) `Hendrik Makait`_

docs/source/scheduling-policies.rst

@@ -264,8 +264,8 @@ Adjusting or disabling queuing
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 *It's rare to need to adjust queuing. The default value works well for almost all cases.
-Only advanced users wanting to tune performance in unusual cases might consider adjusing
-this parameter.*
+*Only advanced users wanting to tune performance in unusual cases might consider
+*adjusting this parameter.*
 
 Queuing behavior is controlled by the ``distributed.scheduler.worker-saturation`` config
 value. This is set via the :doc:`Dask configuration system <configuration>`. The config