(Window Hooks): Remove reference to obsolete Lazy Lock mode.

lispref/windows.texi

@@ -2288,8 +2288,7 @@ window displays a different part of its buffer or a different buffer.
 There are three actions that can change this: scrolling the window,
 switching buffers in the window, and changing the size of the window.
 The first two actions run @code{window-scroll-functions}; the last runs
-@code{window-size-change-functions}.  The paradigmatic use of these
-hooks is in the implementation of Lazy Lock mode; see @file{lazy-lock.el}.
+@code{window-size-change-functions}.
 
 @defvar window-scroll-functions
 This variable holds a list of functions that Emacs should call before