Update some parts of the xml.etree documentation.

Doc/library/xml.etree.rst

-:mod:`xml.etree` --- The ElementTree API for XML
-================================================
-
-.. module:: xml.etree
-   :synopsis: Package containing common ElementTree modules.
-.. moduleauthor:: Fredrik Lundh <fredrik@pythonware.com>
-
-
-.. versionadded:: 2.5
-
-The ElementTree package is a simple, efficient, and quite popular  library for
-XML manipulation in Python.    The :mod:`xml.etree` package contains the most
-common components  from the ElementTree API library.  In the current release,
-this package contains the :mod:`ElementTree`,  :mod:`ElementPath`, and
-:mod:`ElementInclude` modules from the full  ElementTree distribution.
-
-.. XXX To be continued!
-
-
-.. seealso::
-
-   `ElementTree Overview <http://effbot.org/tag/elementtree>`_
-      The home page for :mod:`ElementTree`.  This includes links  to additional
-      documentation, alternative implementations, and  other add-ons.