generate documentation from config.sample.php

admin_manual/configuration_server/config_sample_php_parameters.rst

@@ -2160,6 +2160,15 @@ Most installs shall not modify this value.
 
 Defaults to ``0022``
 
+::
+
+	'localstorage.unlink_on_truncate' => false,
+
+This options allows storage systems that don't allow to modify existing files
+to overcome this limitation by removing the files before overwriting.
+
+Defaults to ``false``
+
 ::
 
 	'quota_include_external_storage' => false,