diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst
index 70840da..3c2f8d2 100644
--- a/Doc/library/ast.rst
+++ b/Doc/library/ast.rst
@@ -135,7 +135,7 @@
    from untrusted sources without the need to parse the values oneself.
 
 
-.. function:: get_docstring(node, clean=True):
+.. function:: get_docstring(node, clean=True)
 
    Return the docstring of the given *node* (which must be a
    :class:`FunctionDef`, :class:`ClassDef` or :class:`Module` node), or ``None``
diff --git a/Doc/library/ctypes.rst b/Doc/library/ctypes.rst
index 61c1e61..51d340c 100644
--- a/Doc/library/ctypes.rst
+++ b/Doc/library/ctypes.rst
@@ -1395,11 +1395,6 @@
 to request and change the ctypes private copy of the windows error
 code.
 
-.. versionchanged:: 2.6
-
-The `use_errno` and `use_last_error` parameters were added in Python
-2.6.
-
 .. data:: RTLD_GLOBAL
    :noindex:
 
@@ -1561,22 +1556,23 @@
       Assign a Python function or another callable to this attribute. The
       callable will be called with three or more arguments:
 
+      .. function:: callable(result, func, arguments)
+         :noindex:
 
-.. function:: callable(result, func, arguments)
-   :noindex:
+         ``result`` is what the foreign function returns, as specified
+         by the :attr:`restype` attribute.
 
-   ``result`` is what the foreign function returns, as specified by the
-   :attr:`restype` attribute.
+         ``func`` is the foreign function object itself, this allows
+         to reuse the same callable object to check or post process
+         the results of several functions.
 
-   ``func`` is the foreign function object itself, this allows to reuse the same
-   callable object to check or post process the results of several functions.
+         ``arguments`` is a tuple containing the parameters originally
+         passed to the function call, this allows to specialize the
+         behavior on the arguments used.
 
-   ``arguments`` is a tuple containing the parameters originally passed to the
-   function call, this allows to specialize the behavior on the arguments used.
-
-   The object that this function returns will be returned from the foreign
-   function call, but it can also check the result value and raise an exception
-   if the foreign function call failed.
+      The object that this function returns will be returned from the
+      foreign function call, but it can also check the result value
+      and raise an exception if the foreign function call failed.
 
 
 .. exception:: ArgumentError()
@@ -1605,10 +1601,6 @@
    variable is exchanged with the real `errno` value bafore and after the call;
    `use_last_error` does the same for the Windows error code.
 
-   .. versionchanged:: 2.6
-      The optional `use_errno` and `use_last_error` parameters were
-      added.
-
 
 .. function:: WINFUNCTYPE(restype, *argtypes, use_errno=False, use_last_error=False)
 
@@ -1786,11 +1778,19 @@
    ctypes type or instance.
 
 
-.. function:: byref(obj)
+.. function:: byref(obj[, offset])
 
-   Returns a light-weight pointer to ``obj``, which must be an instance of a ctypes
-   type. The returned object can only be used as a foreign function call parameter.
-   It behaves similar to ``pointer(obj)``, but the construction is a lot faster.
+   Returns a light-weight pointer to ``obj``, which must be an
+   instance of a ctypes type.  ``offset`` defaults to zero, it must be
+   an integer which is added to the internal pointer value.
+
+   ``byref(obj, offset)`` corresponds to this C code::
+
+      (((char *)&obj) + offset)
+
+   The returned object can only be used as a foreign function call
+   parameter.  It behaves similar to ``pointer(obj)``, but the
+   construction is a lot faster.
 
 
 .. function:: cast(obj, type)
diff --git a/Doc/library/numbers.rst b/Doc/library/numbers.rst
index c74bd47..ef4bd80 100644
--- a/Doc/library/numbers.rst
+++ b/Doc/library/numbers.rst
@@ -71,10 +71,10 @@
 
 .. class:: Integral
 
-   Subtypes :class:`Rational` and adds a conversion to :class:`long`, the
-   3-argument form of :func:`pow`, and the bit-string operations: ``<<``,
-   ``>>``, ``&``, ``^``, ``|``, ``~``. Provides defaults for :func:`float`,
-   :attr:`Rational.numerator`, and :attr:`Rational.denominator`.
+   Subtypes :class:`Rational` and adds a conversion to :class:`int`.
+   Provides defaults for :func:`float`, :attr:`Rational.numerator`, and
+   :attr:`Rational.denominator`, and bit-string operations: ``<<``,
+   ``>>``, ``&``, ``^``, ``|``, ``~``.
 
 
 Notes for type implementors
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index 0dd520e..4cb14e7 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -1517,21 +1517,15 @@
 
       Return a new set with elements from both sets.
 
-      .. versionchanged:: 2.6
-         Accepts multiple input iterables.
-
    .. method:: intersection(other, ...)
                set & other & ...
 
       Return a new set with elements common to both sets.
 
-      .. versionchanged:: 2.6
-         Accepts multiple input iterables.
+   .. method:: difference(other, ...)
+               set - other - ...
 
-   .. method:: difference(other)
-               set - other
-
-      Return a new set with elements in the set that are not in *other*.
+      Return a new set with elements in the set that are not in the others.
 
    .. method:: symmetric_difference(other)
                set ^ other
@@ -1595,10 +1589,13 @@
       .. versionchanged:: 2.6
          Accepts multiple input iterables.
 
-   .. method:: difference_update(other)
-               set -= other
+   .. method:: difference_update(other, ...)
+               set -= other | ...
 
-      Update the set, removing elements found in *other*.
+      Update the set, removing elements found in others.
+
+      .. versionchanged:: 2.6
+         Accepts multiple input iterables.
 
    .. method:: symmetric_difference_update(other)
                set ^= other