Remove 2.6 versionchanges, turn 2.7 ones into 3.1.

Doc/c-api/object.rst

@@ -262,8 +262,6 @@ is considered sufficient for this determination.
    allowing a type to explicitly indicate to the interpreter that it is not
    hashable.
 
-   .. versionadded:: 2.6
-
 
 .. cfunction:: int PyObject_IsTrue(PyObject *o)
 

Doc/documenting/markup.rst

@@ -598,7 +598,7 @@ units as well as normal text:
 
    Example::
 
-      .. versionadded:: 2.5
+      .. versionadded:: 3.1
          The *spam* parameter.
 
    Note that there must be no blank line between the directive head and the

Doc/extending/windows.rst

@@ -107,10 +107,6 @@ described here are distributed with the Python sources in the
    to avoid confusion with a system library :file:`spam.dll` to which your module
    could be a Python interface.
 
-   .. versionchanged:: 2.5
-      Previously, file names like :file:`spam.dll` (in release mode) or
-      :file:`spam_d.dll` (in debug mode) were also recognized.
-
    Now your options are:
 
 #. Copy :file:`example.sln` and :file:`example.vcproj`, rename them to

Doc/library/http.cookies.rst

@@ -131,9 +131,6 @@ Morsel Objects
 
    The keys are case-insensitive.
 
-   .. versionadded:: 2.6
-      The :attr:`httponly` attribute was added.
-
 
 .. attribute:: Morsel.value
 

Doc/library/sqlite3.rst

@@ -562,16 +562,11 @@ Row Objects
    If two :class:`Row` objects have exactly the same columns and their
    members are equal, they compare equal.
 
-   .. versionchanged:: 2.6
-      Added iteration and equality (hashability).
-
    .. method:: keys
 
       This method returns a tuple of column names. Immediately after a query,
       it is the first member of each tuple in :attr:`Cursor.description`.
 
-      .. versionadded:: 2.6
-
 Let's assume we initialize a table as in the example given above::
 
     conn = sqlite3.connect(":memory:")

Doc/library/stdtypes.rst

@@ -461,8 +461,6 @@ The float type has some additional methods.
     :exc:`OverflowError` on infinities and a :exc:`ValueError` on
     NaNs.
 
-    .. versionadded:: 2.6
-
 Two methods support conversion to
 and from hexadecimal strings.  Since Python's floats are stored
 internally as binary numbers, converting a float to or from a

Doc/library/test.rst

@@ -353,5 +353,3 @@ The :mod:`test.support` module defines the following classes:
    Class used to record warnings for unit tests. See documentation of
    :func:`check_warnings` above for more details.
 
-   .. versionadded:: 2.6
-

Doc/library/warnings.rst

@@ -335,8 +335,3 @@ Available Context Managers
     module returned when you import :mod:`warnings` whose filter will be
     protected. This argument exists primarily for testing the :mod:`warnings`
     module itself.
-
-    .. versionchanged:: 3.0
-
-       Constructor arguments turned into keyword-only arguments.
-

Doc/library/zipfile.rst

@@ -67,7 +67,7 @@ The module defines the following items:
    otherwise returns ``False``.  *filename* may be a file or file-like object too.
    This module does not currently handle ZIP files which have appended comments.
 
-   .. versionchanged:: 2.7
+   .. versionchanged:: 3.1
       Support for file and file-like objects.
 
 .. data:: ZIP_STORED