DOC: add missing 'In typing since ...' mention for TypeIs (#548)

neutrinoceros · web-flow · commit 3218d774e438 · 2025-03-23T19:56:57.000+01:00
diff --git a/doc/index.rst b/doc/index.rst
@@ -380,6 +380,7 @@ Special typing primitives
 .. data:: TypeIs
 
    See :pep:`742`. Similar to :data:`TypeGuard`, but allows more type narrowing.
+   In ``typing`` since 3.13.
 
    .. versionadded:: 4.10.0
 
