Update _index.md

Sprintr release notes 2025.08.31

Author: mxfmg1982

content/en/docs/releasenotes/developer-portal/_index.md

@@ -21,6 +21,15 @@ To see the current status of the Mendix Portal, see [Mendix Status](https://stat
 
 ## 2025
 
+### August 31, 2025
+
+#### Improvements
+
+* We’ve expanded Project Overview with two new sections to give you a clearer view of what’s happening in your projects:
+
+   * Project Management: Instantly see the latest user stories your team is working on, with full support for Epics and Jira.
+   * Project Activity: Keep track of all key project events in one place, making it easier to follow progress at a glance.
+
 ### August 21, 2025
 
 #### New Features