Remove many "versionchanged" items that didn't use the official markup,
but just some text embedded in the docs.

Also remove paragraph about implicit relative imports from tutorial.
diff --git a/Doc/library/fcntl.rst b/Doc/library/fcntl.rst
index 7244e7b..0e69407 100644
--- a/Doc/library/fcntl.rst
+++ b/Doc/library/fcntl.rst
@@ -65,7 +65,7 @@
    so long as the buffer you pass is as least as long as what the operating system
    wants to put there, things should work.
 
-   If *mutate_flag* is true, then the buffer is (in effect) passed to the
+   If *mutate_flag* is true (the default), then the buffer is (in effect) passed to the
    underlying :func:`ioctl` system call, the latter's return code is passed back to
    the calling Python, and the buffer's new contents reflect the action of the
    :func:`ioctl`.  This is a slight simplification, because if the supplied buffer
@@ -73,10 +73,6 @@
    long which is then passed to :func:`ioctl` and copied back into the supplied
    buffer.
 
-   If *mutate_flag* is not supplied, then from Python 2.5 it defaults to true,
-   which is a change from versions 2.3 and 2.4. Supply the argument explicitly if
-   version portability is a priority.
-
    An example::
 
       >>> import array, fcntl, struct, termios, os