RE: get-lru-window should mention what lru stands for

[Drew Adams]

>  > Presumably, "lru" stands for "least recently used". That should be
>  > mentioned in the doc string, to avoid confusion. (We should still say
>  > that "used" means selected.)
>
>   get-lru-window is a built-in function in `C source code'.
>   Return the window least recently selected or used for display.
>
> I don't think it could be much clearer.

It's clear what the function does, but what "lru" stands for is not stated.

Either that acronym should be defined or the function should be renamed
(e.g. `get-least-recently-selected-window', or just `least-recent-window').