Fix release notes formatting & phrasing

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

RELEASE_NOTES.md

@@ -22,8 +22,8 @@ In this release, we have made some changes to the API to improve the user experi
 * Add YEARLY frequency to the recurrence definition.
 * Add parameters for pagination and sorting.
 * Documentation of valid values for `count` and `interval` fields was added.
-* Extended filter parameters for recurrence and end time.
-* Add new field end\_time to the DispatchDetail.
+* Extended `DispatchFilter` to support filtering by `recurrence` and `end_time`.
+* Add new field `end_time` to the `DispatchDetail`.
 
 ## Bug Fixes