Add documentation for Mac OS user and update version

Add documentation with an example directory a Mac OS user would use when
making a directory for database state, as part of the simple development
sandbox instructions. Also update the version to 3.2.3 for the
evaluation documenation.

docs/evaluation.md

@@ -44,7 +44,7 @@ wiki page for the list of releases. We recommend using the latest release.
 Here is an example (but please check the wiki page for the latest release number):
 
 ```
-export COMANAGE_REGISTRY_VERSION=3.2.1
+export COMANAGE_REGISTRY_VERSION=3.2.3
 ```
 
 * Build the base COmanage Registry image:

docs/simple-development.md

@@ -30,12 +30,18 @@ log into COmanage Registry but do not save any changes. Be sure to run
 `docker compose down` so that no containers are left running.
 
 * Create a directory somewhere to save the state of the COmanage Registry
-database. For example
+database. For example, on Linux
 
 ```
 sudo mkdir -p /srv/docker/var/lib/postgresql/data
 ```
 
+On Mac OS you might instead do something like
+
+```
+mkdir -p $HOME/comanage-data/postgresql/data
+```
+
 * Clone the COmanage Registry repository somewhere, for example
 
 ```