gh-149083: Use sentinel in functool.rst docs

sobolevn · sobolevn · commit 23be0ac56461 · 2026-04-30T10:42:30.000+03:00
diff --git a/Doc/library/functools.rst b/Doc/library/functools.rst
@@ -468,7 +468,7 @@ The :mod:`!functools` module defines the following functions:
 
    Roughly equivalent to::
 
-      initial_missing = object()
+      initial_missing = sentinel('initial_missing')
 
       def reduce(function, iterable, /, initial=initial_missing):
           it = iter(iterable)
