* doc/lispref/windows.texi (Basic Windows): Add an @anchor for "Window
Groups". Correct example function to `window-group-start'.
(Window Start and End, Textual scrolling): Point to the new anchor. State
that (most of) the args in window group functions have the same meaning as for
the corresponding window primitives.
* doc/lispref/positions.texi (Screen Lines). Same as above.
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