Add changelog entry

CHANGELOG.md

@@ -8,7 +8,12 @@
 
 **Bug fixes**
 
-- Fixed `EuiDataGrid` cell props not resetting on column sort ([#5665](https://github.com/elastic/eui/issues/5665))
+- Fixed `EuiDataGrid` cell props not resetting on column sort ([#5665](https://github.com/elastic/eui/pull/5665))
+
+**Breaking changes**
+
+- `EuiDataGrid` now only shows the first 2 `cellActions` alongside the expansion button - all additional actions will now be shown in cell expansion popover footer ([#5675](https://github.com/elastic/eui/pull/5675))
+- `EuiDataGrid` now forces `isExpandable` to be true if any `cellActions` are passed, as keyboard users are otherwise be unable to access cell actions without the expansion popover ([#5675](https://github.com/elastic/eui/pull/5675))
 
 ## [`49.0.0`](https://github.com/elastic/eui/tree/v49.0.0)