bpo-40204: Add :noindex: in the documentation (GH-21859)

Add :noindex: to duplicated documentation to fix "duplicate object
description" errors.

For example, fix this Sphinx 3 issue:

Doc/library/configparser.rst:1146: WARNING: duplicate object
description of configparser.ConfigParser.optionxform, other instance
in library/configparser, use :noindex: for one of them

Doc/library/aifc.rst

@@ -208,6 +208,7 @@ number of frames must be filled in.
 
 
 .. method:: aifc.tell()
+   :noindex:
 
    Return the current write position in the output file.  Useful in combination
    with :meth:`setmark`.
@@ -232,6 +233,7 @@ number of frames must be filled in.
 
 
 .. method:: aifc.close()
+   :noindex:
 
    Close the AIFF file.  The header of the file is updated to reflect the actual
    size of the audio data. After calling this method, the object can no longer be

Doc/library/configparser.rst

@@ -696,6 +696,7 @@ be overridden by subclasses or by attribute assignment.
    ``enabled``/``disabled``.
 
 .. method:: ConfigParser.optionxform(option)
+   :noindex:
 
    This method transforms option names on every read, get, or set
    operation.  The default converts the name to lowercase.  This also

Doc/library/difflib.rst

@@ -24,6 +24,7 @@ diffs. For comparing directories and files, see also, the :mod:`filecmp` module.
 
 
 .. class:: SequenceMatcher
+   :noindex:
 
    This is a flexible class for comparing pairs of sequences of any type, so long
    as the sequence elements are :term:`hashable`.  The basic algorithm predates, and is a
@@ -651,6 +652,7 @@ The :class:`Differ` class has this constructor:
 
 
 .. class:: Differ(linejunk=None, charjunk=None)
+   :noindex:
 
    Optional keyword parameters *linejunk* and *charjunk* are for filter functions
    (or ``None``):

Doc/library/enum.rst

@@ -50,6 +50,7 @@ helper, :class:`auto`.
     the bitwise operations without losing their :class:`Flag` membership.
 
 .. function:: unique
+   :noindex:
 
     Enum class decorator that ensures only one name is bound to any one value.
 

Doc/library/socket.rst

@@ -1695,7 +1695,9 @@ to sockets.
 
 .. method:: socket.setsockopt(level, optname, value: int)
 .. method:: socket.setsockopt(level, optname, value: buffer)
+   :noindex:
 .. method:: socket.setsockopt(level, optname, None, optlen: int)
+   :noindex:
 
    .. index:: module: struct
 

Doc/library/tarfile.rst

@@ -151,6 +151,7 @@ Some facts and figures:
 
 
 .. class:: TarFile
+   :noindex:
 
    Class for reading and writing tar archives. Do not use this class directly:
    use :func:`tarfile.open` instead. See :ref:`tarfile-objects`.

Doc/library/token.rst

@@ -70,6 +70,7 @@ the :mod:`tokenize` module.
 
 
 .. data:: TYPE_COMMENT
+   :noindex:
 
    Token value indicating that a type comment was recognized.  Such
    tokens are only produced when :func:`ast.parse()` is invoked with

Doc/library/turtle.rst

@@ -1069,6 +1069,7 @@ More drawing control
 ~~~~~~~~~~~~~~~~~~~~
 
 .. function:: reset()
+   :noindex:
 
    Delete the turtle's drawings from the screen, re-center the turtle and set
    variables to the default values.
@@ -1090,6 +1091,7 @@ More drawing control
 
 
 .. function:: clear()
+   :noindex:
 
    Delete the turtle's drawings from the screen.  Do not move turtle.  State and
    position of the turtle as well as drawings of other turtles are not affected.
@@ -1362,6 +1364,7 @@ Using events
 ------------
 
 .. function:: onclick(fun, btn=1, add=None)
+   :noindex:
 
    :param fun: a function with two arguments which will be called with the
                coordinates of the clicked point on the canvas

Doc/library/urllib.request.rst

@@ -946,7 +946,7 @@ tracking URIs for which authentication credentials should always be sent.
    If *is_authenticated* is specified as ``True``, *realm* is ignored.
 
 
-.. method:: HTTPPasswordMgr.find_user_password(realm, authuri)
+.. method:: HTTPPasswordMgrWithPriorAuth.find_user_password(realm, authuri)
 
    Same as for :class:`HTTPPasswordMgrWithDefaultRealm` objects