Move the 3k reST doc tree in place.

Doc/library/strings.rst

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+
+.. _stringservices:
+
+***************
+String Services
+***************
+
+The modules described in this chapter provide a wide range of string
+manipulation operations.
+
+In addition, Python's built-in string classes support the sequence type
+methods described in the :ref:`typesseq` section, and also the
+string-specific methods described in the :ref:`string-methods` section.
+To output formatted strings use template strings or the ``%`` operator
+described in the :ref:`string-formatting` section. Also, see the
+:mod:`re` module for string functions based on regular expressions.
+
+
+.. toctree::
+
+   string.rst
+   re.rst
+   struct.rst
+   difflib.rst
+   stringio.rst
+   textwrap.rst
+   codecs.rst
+   unicodedata.rst
+   stringprep.rst
+   fpformat.rst
+