Docs: improve generic `typing.NamedTuple` example (#124739)

diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
index 640bc2c9d503bc8f6ddf4a29f72a04fd34bc8fea..cd8b90854b0e94330d6d92cdddb17c7b2748b51b 100644 (file)
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -2349,7 +2349,9 @@ types.
 
    Backward-compatible usage::
 
-       # For creating a generic NamedTuple on Python 3.11 or lower
+       # For creating a generic NamedTuple on Python 3.11
+       T = TypeVar("T")
+
        class Group(NamedTuple, Generic[T]):
            key: T
            group: list[T]