Add change log entry + note on docs

Author: cooperlees

CHANGES.md

@@ -21,6 +21,7 @@
 ### Packaging
 
 <!-- Changes to how Black is packaged, such as dependency requirements -->
+- Change Dockerfile to hatch + compile black (#3965)
 
 ### Parser
 

docs/usage_and_configuration/black_docker_image.md

@@ -24,6 +24,8 @@ created for all unreleased
 [commits on the `main` branch](https://github.com/psf/black/commits/main). This tag is
 not meant to be used by external users.
 
+From version 23.11.0 the Docker image installs a compiled black into the image.
+
 ## Usage
 
 A permanent container doesn't have to be created to use _Black_ as a Docker image. It's