Add release note for mdn#10581

ddbeck · Jun 3, 2021 · 2e6072d · 2e6072d
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diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
@@ -100,6 +100,13 @@ RELEASE DATE TK
 
   </details>
 
+- The following non-existent, long-removed, or otherwise irrelevant features have been removed ([#10581](https://github.com/mdn/browser-compat-data/pull/10581)):
+
+  - `api.Document.undoManager`
+  - `api.Element.tabStop`
+  - `api.HTMLElement.forceSpellCheck`
+  - `api.PaymentAddress.regionCode`
+
 ## [v3.3.5](https://github.com/mdn/browser-compat-data/releases/tag/v3.3.5)
 
 May 27, 2021