[3.9] bpo-42811: Update importlib.utils.resolve_name() docs to use __spec__.parent (GH-24100) (GH-24149)

This is a backport of 
#24100

Automerge-Triggered-By: GH:brettcannon

Author: yairfrid

Doc/library/importlib.rst

@@ -1473,7 +1473,7 @@ an :term:`importer`.
 
    If  **name** has no leading dots, then **name** is simply returned. This
    allows for usage such as
-   ``importlib.util.resolve_name('sys', __package__)`` without doing a
+   ``importlib.util.resolve_name('sys', __spec__.parent)`` without doing a
    check to see if the **package** argument is needed.
 
    :exc:`ImportError` is raised if **name** is a relative module name but

Misc/NEWS.d/next/Documentation/2021-01-07-12-08-59.bpo-42811.ePF7EC.rst

@@ -0,0 +1,2 @@
+Updated importlib.utils.resolve_name() doc to use __spec__.parent instead of
+__package__. (Thanks Yair Frid.)