js nodes, docs, add entry in deprecation/removal table

Author: jakobandersen

doc/extdev/deprecated.rst

@@ -748,6 +748,11 @@ The following is a list of deprecated interfaces.
      - 4.0
      - ``sphinx.domains.std.StandardDomain.process_doc()``
 
+   * - ``sphinx.domains.js.JSObject.display_prefix``
+     - 
+     - 4.3
+     - ``sphinx.domains.js.JSObject.get_display_prefix()``
+
    * - ``sphinx.environment.NoUri``
      - 2.1
      - 3.0