bpo-31370: Remove references to threadless builds (#8805)

Support for threadless builds was removed in a6a4dc81.
diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index 694b466..e51a255 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -842,18 +842,18 @@
 
 .. c:function:: PyThreadState* PyEval_SaveThread()
 
-   Release the global interpreter lock (if it has been created and thread
-   support is enabled) and reset the thread state to *NULL*, returning the
-   previous thread state (which is not *NULL*).  If the lock has been created,
-   the current thread must have acquired it.
+   Release the global interpreter lock (if it has been created) and reset the
+   thread state to *NULL*, returning the previous thread state (which is not
+   *NULL*).  If the lock has been created, the current thread must have
+   acquired it.
 
 
 .. c:function:: void PyEval_RestoreThread(PyThreadState *tstate)
 
-   Acquire the global interpreter lock (if it has been created and thread
-   support is enabled) and set the thread state to *tstate*, which must not be
-   *NULL*.  If the lock has been created, the current thread must not have
-   acquired it, otherwise deadlock ensues.
+   Acquire the global interpreter lock (if it has been created) and set the
+   thread state to *tstate*, which must not be *NULL*.  If the lock has been
+   created, the current thread must not have acquired it, otherwise deadlock
+   ensues.
 
 
 .. c:function:: PyThreadState* PyThreadState_Get()
diff --git a/Doc/library/queue.rst b/Doc/library/queue.rst
index 1520faa..6106d0c 100644
--- a/Doc/library/queue.rst
+++ b/Doc/library/queue.rst
@@ -11,9 +11,7 @@
 The :mod:`queue` module implements multi-producer, multi-consumer queues.
 It is especially useful in threaded programming when information must be
 exchanged safely between multiple threads.  The :class:`Queue` class in this
-module implements all the required locking semantics.  It depends on the
-availability of thread support in Python; see the :mod:`threading`
-module.
+module implements all the required locking semantics.
 
 The module implements three types of queue, which differ only in the order in
 which the entries are retrieved.  In a :abbr:`FIFO (first-in, first-out)`