[3.13] gh-134733: Fix documentation for the show_empty option of ast.dump() (GH-134925) (GH-134941)

Optional None values are always omitted.
(cherry picked from commit 1a89991)

Co-authored-by: Serhiy Storchaka <[email protected]>

Author: miss-islington

Doc/library/ast.rst

@@ -2440,8 +2440,9 @@ and classes for traversing abstract syntax trees:
    indents that many spaces per level.  If *indent* is a string (such as ``"\t"``),
    that string is used to indent each level.
 
-   If *show_empty* is ``False`` (the default), empty lists and fields that are ``None``
-   will be omitted from the output.
+   If *show_empty* is false (the default), optional empty lists will be
+   omitted from the output.
+   Optional ``None`` values are always omitted.
 
    .. versionchanged:: 3.9
       Added the *indent* option.