chore: update changelog

Author: mgadewoll

packages/eui/changelogs/upcoming/8778.md

@@ -1,6 +1,7 @@
-- - Added new `refresh` design for input styles on form picker components:
+- Added new `refresh` design for input styles on form picker components:
   - `EuiComboBox`
   - `EuiFilePicker`
   - `EuiDatePicker`
   - `EuiSuperDatePicker`
+- Updated the font size of `xs` size `EuiButtonEmpty` to `14px`