gh-138644: Update c-api docs of PyInterpreterState about PEP-684

Doc/c-api/init.rst

@@ -1020,6 +1020,11 @@
    interpreter lock is also shared by all threads, regardless of to which
    interpreter they belong.
 
+   .. versionchanged:: 3.12
+
+      :pep:`684` introduced a possibility of :ref:`per-interpreter` GIL.
+      See :c:func:`Py_NewInterpreterFromConfig`.
+
 
 .. c:type:: PyThreadState
 
@@ -1711,6 +1716,8 @@
    haven't been explicitly destroyed at that point.
 
 
+.. _per-interpreter-gil:
+
 A Per-Interpreter GIL
 ---------------------
 
@@ -1722,7 +1729,7 @@
 single Python process can truly take advantage of multiple CPU cores
 when running Python code.  The isolation also encourages a different
 approach to concurrency than that of just using threads.
-(See :pep:`554`.)
+(See :pep:`554` and :pep:`684`.)
 
 Using an isolated interpreter requires vigilance in preserving that
 isolation.  That especially means not sharing any objects or mutable