gh-151943: Document minidom specific differences in the minidom docs

Each of the NodeList and NamedNodeMap interfaces has two implementations
in minidom, which support additional operations.  Move this and the
notes about strictErrorChecking and Attr.specified out of the
documentation of the generic DOM interface.

Author: serhiy-storchaka

Doc/library/xml.dom.minidom.rst

@@ -245,12 +245,24 @@ rules apply:
   Instead, :mod:`!xml.dom.minidom` uses standard Python exceptions such as
   :exc:`TypeError` and :exc:`AttributeError`.
 
-* The :mod:`!xml.dom.minidom` implementation of :class:`~xml.dom.NodeList`
-  is a subclass of :class:`list`.
-  In addition to the interface defined in the DOM specification,
-  it supports all list operations, which are much more "Pythonic".
-  Nodes which cannot have children use another implementation,
-  which is a subclass of :class:`tuple`.
+* 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`:
 

Doc/library/xml.dom.rst

@@ -635,7 +635,6 @@ inherits properties from :class:`Node`.
 .. attribute:: Document.strictErrorChecking
 
    Whether error checking is enforced.
-   Always ``False`` in :mod:`xml.dom.minidom`.
 
 
 .. attribute:: Document.documentURI
@@ -926,7 +925,6 @@ and :attr:`~Node.nextSibling` are always ``None``.
 
    Whether the value of the attribute was explicitly set in the document,
    as opposed to being defaulted from the DTD.
-   Always ``False`` in :mod:`xml.dom.minidom`.
    This is a read-only attribute.
 
 
@@ -995,13 +993,8 @@ NamedNodeMap Objects
    Remove and return the node with the given namespace URI and local name.
    Raise :exc:`NotFoundErr` if there is no such node.
 
-:mod:`xml.dom.minidom` provides additional methods which make the attribute
-map of an element behave more like a mapping: :meth:`!get`, :meth:`!keys`,
-:meth:`!keysNS`, :meth:`!values`, :meth:`!items` and :meth:`!itemsNS`, as well
-as ``len()``, ``in``, subscription and deletion.  They are not available for
-:attr:`DocumentType.entities` and :attr:`DocumentType.notations`, which are
-read-only.  You can also use the standardized :meth:`!getAttribute\*` family of
-methods on the :class:`Element` objects.
+You can also use the standardized :meth:`!getAttribute\*` family of methods
+on the :class:`Element` objects.
 
 
 .. _dom-documentfragment-objects: