update changelog

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

changelog/unreleased/change-references.md

@@ -1,8 +1,8 @@
-Change: Different type of references
+Change: absolute and relative references
 
 We unified the `Reference_Id` end `Reference_Path` types to a combined `Reference` that contains both:
-- id based properties that can identify a node using a `storage_id` and `node_id`
+- a `resource_id` property that can identify a node using a `storage_id` and an `opaque_id`
 - a `path` property that can be used to represent absolute paths as well as paths relative to the id based properties.
-While this is a breaking change it allows more flexible passing of references.
+While this is a breaking change it allows passing both: absolute as well as relative references.
 
 https://github.com/cs3org/reva/pull/1721