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/getpass.rst b/Doc/library/getpass.rst
index 91c811b..ff1c091 100644
--- a/Doc/library/getpass.rst
+++ b/Doc/library/getpass.rst
@@ -12,11 +12,11 @@
 
 .. function:: getpass([prompt[, stream]])
 
-   Prompt the user for a password without echoing.  The user is prompted using the
-   string *prompt*, which defaults to ``'Password: '``. On Unix, the prompt is
-   written to the file-like object *stream*.  *stream* defaults to the
-   controlling terminal (/dev/tty) or if that is unavailable to ``sys.stderr``
-   (this argument is ignored on Windows).
+   Prompt the user for a password without echoing.  The user is prompted using
+   the string *prompt*, which defaults to ``'Password: '``.  On Unix, the prompt
+   is written to the file-like object *stream*.  *stream* defaults to the
+   controlling terminal (:file:`/dev/tty`) or if that is unavailable to
+   ``sys.stderr`` (this argument is ignored on Windows).
 
    If echo free input is unavailable getpass() falls back to printing
    a warning message to *stream* and reading from ``sys.stdin`` and
@@ -24,9 +24,6 @@
 
    Availability: Macintosh, Unix, Windows.
 
-   .. versionchanged:: 2.6
-      On Unix it defaults to using /dev/tty before falling back
-      to ``sys.stdin`` and ``sys.stderr``.
    .. note::
       If you call getpass from within IDLE, the input may be done in the
       terminal you launched IDLE from rather than the idle window itself.