GeezerVison

…embers (pythonGH-155632)

CharacterData was not mentioned at all, although Text, Comment and
CDATASection inherit from it.  Document also DocumentFragment, Entity
and Notation, many implemented members which were omitted, the node type
constants and the exception code constants.

Add class directives for all documented interfaces, so that references
to them resolve, and remove xml.dom.rst from the nit-picky mode
exceptions.

Fix incorrect statements about nodeName, NodeList.item(), CDATASection
and attribute nodes, and describe minidom specific differences in the
minidom documentation.
(cherry picked from commit 922c866)

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