bpo-43774: Remove --without-cycle-gc doc (GH-25364)

vstinner · web-flow · commit 2459b92a4db6 · 2021-04-12T16:58:45.000+01:00
The configure --without-cycle-gc option has been removed in Python 2.3 by the commit cccd1e7. It's now time to remove the last reference to it in the documentation.
diff --git a/Doc/extending/extending.rst b/Doc/extending/extending.rst
@@ -911,12 +911,7 @@ the cycle itself.
 The cycle detector is able to detect garbage cycles and can reclaim them.
 The :mod:`gc` module exposes a way to run the detector (the
 :func:`~gc.collect` function), as well as configuration
-interfaces and the ability to disable the detector at runtime.  The cycle
-detector is considered an optional component; though it is included by default,
-it can be disabled at build time using the :option:`!--without-cycle-gc` option
-to the :program:`configure` script on Unix platforms (including Mac OS X).  If
-the cycle detector is disabled in this way, the :mod:`gc` module will not be
-available.
+interfaces and the ability to disable the detector at runtime.
 
 
 .. _refcountsinpython:
