gh-108223: Refer to PEP 703 as Free Threading (#112780)

Doc/using/configure.rst

@@ -292,7 +292,10 @@ General Options
 .. option:: --disable-gil
 
    Enables **experimental** support for running Python without the
-   :term:`global interpreter lock` (GIL).
+   :term:`global interpreter lock` (GIL): free threading build.
+
+   Defines the ``Py_GIL_DISABLED`` macro and adds ``"t"`` to
+   :data:`sys.abiflags`.
 
    See :pep:`703` "Making the Global Interpreter Lock Optional in CPython".
 

Lib/test/libregrtest/utils.py

@@ -291,7 +291,7 @@ def get_build_info():
 
     # --disable-gil
     if sysconfig.get_config_var('Py_GIL_DISABLED'):
-        build.append("nogil")
+        build.append("free_threading")
 
     if hasattr(sys, 'gettotalrefcount'):
         # --with-pydebug