Sync pre-release CPython 3.15 branch from GitHub (2026-08-30)

Summary:
Imported python/cpython `3.15.0rc1+dev` from upstream rev [`5136a68`](https://www.github.com/python/cpython/commit/5136a686beda8566da8592b90cea4b8e734724b6) (committed 2026-08-30 18:20:30+00:00).

# Commit Info

- Base: (`3.15.0rc1+dev`) - [`79b3919`](https://www.github.com/python/cpython/commit/79b39198ab76b9e7403e1828defcf9451b68f1b1) (commit date: 2026-08-29 18:26:56+00:00)
- Imported: (`3.15.0rc1+dev`) - [`5136a68`](https://www.github.com/python/cpython/commit/5136a686beda8566da8592b90cea4b8e734724b6) (commit date: 2026-08-30 18:20:30+00:00)

Differential Revision: D118085448

fbshipit-source-id: 57c3f45670c2eb6eeb752290ff4229f121350791

Author: generatedunixname1734921407115435

Doc/library/site.rst

@@ -453,9 +453,10 @@ Module contents
 
    Return a list containing all global site-packages directories.
 
-   For each directory present in *prefixes* (or :data:`PREFIXES` if *prefixes*
-   is ``None``), this function will find its site-packages subdirectory
-   depending on the system environment, and will return a list of full paths.
+   For each directory given in *prefixes* (or :data:`PREFIXES` if *prefixes*
+   is ``None``), this function will compute its site-packages subdirectory
+   depending on the system environment, and will return a list of full paths,
+   which are not checked for existence.
 
    .. versionadded:: 3.2
 

Doc/library/xml.dom.minidom.rst

@@ -245,11 +245,24 @@ rules apply:
   Instead, :mod:`!xml.dom.minidom` uses standard Python exceptions such as
   :exc:`TypeError` and :exc:`AttributeError`.
 
-* :class:`NodeList` objects are implemented using Python's built-in list type.
-  These objects provide the interface defined in the DOM specification, but with
-  earlier versions of Python they do not support the official API.  They are,
-  however, much more "Pythonic" than the interface defined in the W3C
-  recommendations.
+* Each of the :class:`~xml.dom.NodeList` and :class:`~xml.dom.NamedNodeMap`
+  interfaces has two implementations, which provide additional methods and
+  operations.
+
+  :attr:`~xml.dom.Node.childNodes` is a subclass of :class:`list`, or, for
+  nodes which cannot have children, a subclass of :class:`tuple`.
+  It supports iteration, concatenation, indexing and slicing.
+
+  :attr:`~xml.dom.Node.attributes` supports ``len()``, the :keyword:`in`
+  operator, subscription by a name or by a ``(namespaceURI, localName)``
+  tuple, assignment and deletion, and the methods :meth:`!get`, :meth:`!keys`,
+  :meth:`!keysNS`, :meth:`!values`, :meth:`!items` and :meth:`!itemsNS`.
+  :attr:`~xml.dom.DocumentType.entities` and
+  :attr:`~xml.dom.DocumentType.notations` are read-only and support only
+  ``len()`` and subscription by a name.
+
+* :attr:`~xml.dom.Document.strictErrorChecking` and
+  :attr:`~xml.dom.Attr.specified` are always ``False``.
 
 The following interfaces have no implementation in :mod:`!xml.dom.minidom`: