Merge pull request #8800 from OdumInstitute/8791_multi_license_intro_correction

correct multi-license introductory description

Author: kcondon

doc/sphinx-guides/source/installation/config.rst

@@ -988,12 +988,14 @@ Once this script is running, you can look in the Google Analytics console (Realt
 Configuring Licenses
 --------------------
 
-Out of the box, users select from the following licenses or terms:
+On a new Dataverse installation, users may select from the following licenses or terms:
 
 - CC0 1.0 (default)
 - CC BY 4.0
 - Custom Dataset Terms
 
+(Note that existing Dataverse installations which are upgraded from 5.9 or previous will only offer CC0 1.0, added automatically during the upgrade to version 5.10.)
+
 You have a lot of control over which licenses and terms are available. You can remove licenses and add new ones. You can decide which license is the default. You can remove "Custom Dataset Terms" as a option. You can remove all licenses and make "Custom Dataset Terms" the only option.
 
 Before making changes, you are encouraged to read the :ref:`license-terms` section of the User Guide about why CC0 is the default and what the "Custom Dataset Terms" option allows.