doc: Update CHANGELOG

CHANGELOG.md

@@ -22,6 +22,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - The generation of the unique ID has been changed resp. aligned for 2D meshes to increment Y-first and X-second. This way the address range and ID increment are consistent with each other.
 - Broadcasted input `id_i` in the chimneys should not throw an error anymore in elaboration.
 - The `id_offset` should not be correctly applied in the system address map. Before it resulted in negative coordinates.
+- The `axi_ch_e` types now have an explicit bitwidth. Previously, this caused issues during elaboration since a 32-bit integer was used as a type.
 
 ### Removed