[3.10] Remove draft notice on the 3.10 What's new document (GH-28806) (GH-28807)

Automerge-Triggered-By: GH:pablogsal
(cherry picked from commit 32485ce)


Co-authored-by: Pablo Galindo Salgado <[email protected]>

Author: miss-islington

Doc/whatsnew/3.10.rst

@@ -50,13 +50,6 @@ This article explains the new features in Python 3.10, compared to 3.9.
 
 For full details, see the :ref:`changelog <changelog>`.
 
-.. note::
-
-   Prerelease users should be aware that this document is currently in draft
-   form. It will be updated substantially as Python 3.10 moves towards release,
-   so it's worth checking back even after reading earlier versions.
-
-
 Summary -- Release highlights
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