[3.14] gh-124694: Add versionadded note to InterpreterPoolExecutor (GH-140605)

(cherry picked from commit 421a475)

Co-authored-by: Zachary Ware <[email protected]>

Author: miss-islington

Doc/library/concurrent.futures.rst

@@ -239,6 +239,8 @@ ThreadPoolExecutor Example
 InterpreterPoolExecutor
 -----------------------
 
+.. versionadded:: 3.14
+
 The :class:`InterpreterPoolExecutor` class uses a pool of interpreters
 to execute calls asynchronously.  It is a :class:`ThreadPoolExecutor`
 subclass, which means each worker is running in its own thread.