Use \versionchanged instead of \versionadded for new parameter support.

Doc/lib/libgetpass.tex

@@ -19,7 +19,7 @@ The \module{getpass} module provides two functions:
   \code{sys.stdout} (this argument is ignored on Windows).
 
   Availability: Macintosh, \UNIX, Windows.
-  \versionadded[The \var{stream} parameter]{2.5}
+  \versionchanged[The \var{stream} parameter was added]{2.5}
 \end{funcdesc}