[Unity] Update release note for filter function
Update release note for default filter function support
---
+upgrade:
+ - |
+ A new configuration option called ``report_default_filter_function`` has
+ been added to the Dell EMC Unity driver. It can be set to True or False,
+ and the default value is False. When set to True, the scheduler will
+ disallow the creation of shares smaller than 3 GiB on the Dell EMC Unity
+ back end. The default value of this option will be changed to ``True`` in
+ a future release, so always set the desired value in your manila.conf per
+ your expectations.
features:
- |
Dell EMC Unity: Default filter function support for 3GB share size.
