chore(@mendix/combobox-web): document multiselect chip focus fix

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: samuelreichert

packages/pluggableWidgets/combobox-web/CHANGELOG.md

@@ -10,6 +10,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - We fixed an issue where selecting all of the typed text in a multi-select combobox and pressing Backspace did not permanently clear it, so the text reappeared after clicking away and back into the combobox.
 
+- We fixed an issue where removing a selected item of a multi-select combobox with Backspace or Delete moved keyboard focus out of the combobox, unless the removed item was the last one. Focus now stays on the selected items so you can keep navigating and removing them with the keyboard.
+
 ## [2.9.0] - 2026-07-24
 
 ### Fixed