Change long feedback forum URL with its short counterpart

Author: nachoalonsoportillo

articles/postgresql/flexible-server/concepts-extensions.md

@@ -423,4 +423,4 @@ Azure Database for PostgreSQL flexible server has introduced an [in-place major
 ## Related content
 
 > [!div class="nextstepaction"]
-> [feedback forum](https://feedback.azure.com/d365community/forum/c5e32b97-ee24-ec11-b6e6-000d3a4f0da0)
+> [feedback forum](https://aka.ms/pgfeedback)