Add recommended changelog explainer

.changeset/grumpy-scissors-watch.md

@@ -3,3 +3,23 @@
 ---
 
 Change: `extends` in `overrides` to be consistent with `plugins` behaviour
+
+`overrides.extends` is fixed to make consistency with the `overrides.plugins` behavior and be merged not replaced.
+
+If you would like to keep the previous behavior, you would need to change your config as below:
+
+```diff json
+{
+- "extends": ["config-a"]
+  "overrides": [
+    {
+      "rules": ["*.module.css"],
+      "extends": ["config-b"]
+    },
++   {
++     "rules": ["*.css"],
++     "extends": ["config-a"]
++   },
+  ]
+}
+```