Fix the versionadded info for typing.NoReturn (GH-11880)

The earliest version that `typing.NoReturn` appears in is [3.5.4rc1](https://docs.python.org/3/whatsnew/changelog.html#python-3-5-4-release-candidate-1)

Doc/library/typing.rst

@@ -958,7 +958,7 @@ The module defines the following classes, functions and decorators:
       def stop() -> NoReturn:
           raise RuntimeError('no way')
 
-   .. versionadded:: 3.6.5
+   .. versionadded:: 3.5.4
 
 .. data:: Union