Update Doc/library/threading.rst

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>

Author: donbarbos

Doc/library/threading.rst

@@ -65,8 +65,7 @@ threading when it comes to CPU-bound tasks, as only one thread can execute
 Python bytecode at a time. Despite this, threads remain a useful tool for
 achieving concurrency in many scenarios.
 
-*(Experimental free-threaded builds of CPython disable the GIL, enabling true
-parallel execution of threads, but this feature is still under development.)*
+As of Python 3.13, experimental :term:`free-threaded <free threading>` builds can disable the GIL, enabling true parallel execution of threads, but this feature is not available by default. (See :pep:`703`.)
 
 A typical use case for :mod:`threading` includes managing a pool of worker
 threads that can process multiple tasks concurrently.  This basic example of