[3.14] gh-150232: update Thread group parameter doc (GH-150283) (#150298)

miss-islington · My-ABC · web-flow · commit 67336abc506f · 2026-05-23T14:04:30.000+05:30
gh-150232: update Thread group parameter doc (GH-150283) (cherry picked from commit 82191c6) Co-authored-by: My-ABC <569817555@qq.com>
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
@@ -512,7 +512,7 @@ since it is impossible to detect the termination of alien threads.
    This constructor should always be called with keyword arguments.  Arguments
    are:
 
-   *group* should be ``None``; reserved for future extension when a
+   *group* must be ``None`` as it is reserved for future extension when a
    :class:`!ThreadGroup` class is implemented.
 
    *target* is the callable object to be invoked by the :meth:`run` method.
