DOCS-13920 directoryperdb remove empty dir

Author: andf-mongodb

source/reference/configuration-options.txt

@@ -3566,7 +3566,12 @@ LDAP Parameters
    The :setting:`storage.directoryPerDB` setting is available only for :binary:`~bin.mongod`.
 
    .. include:: /includes/not-available-for-inmemory-storage-engine.rst
-   
+
+   Starting in MongoDB 5.0, dropping the final collection in a database
+   (or dropping the database itself) when
+   :setting:`storage.directoryPerDB` is enabled deletes the newly empty
+   subdirectory for that database.
+
    To change the :setting:`storage.directoryPerDB` option for existing
    deployments:
 

source/reference/program/mongod.txt

@@ -1433,6 +1433,10 @@ Storage Options
 
    .. include:: /includes/not-available-for-inmemory-storage-engine.rst
 
+   Starting in MongoDB 5.0, dropping the final collection in a database
+   (or dropping the database itself) when :option:`--directoryperdb` is
+   enabled deletes the newly empty subdirectory for that database.
+
    To change the :option:`--directoryperdb` option for existing
    deployments:
 

source/release-notes/5.0-compatibility.txt

@@ -204,6 +204,11 @@ General Changes
   stages </reference/operator/aggregation-pipeline>` allowed in a single
   pipeline is limited to 1000.
 
+- Starting in MongoDB 5.0, dropping the final collection in a database
+  (or dropping the database itself) when
+  :setting:`~storage.directoryPerDB` or :option:`--directoryperdb` is
+  enabled deletes the newly empty subdirectory for that database.
+
 - MongoDB 5.0 removes the ``--serviceExecutor`` command-line option and
   the corresponding ``net.serviceExecutor`` configuration option.