More updates to Windows chapter of Lisp manual.

More updates to Windows chapter of Lisp manual.

* doc/lispref/windows.texi (Splitting Windows): Fix error in documentation of
window-combination-limit.
(Cyclic Window Ordering): Minor fixes to next-window,
one-window-p, and get-lru-window docs.  Don't document
window-list-1.
(Buffers and Windows): Copyedits.
(Choosing Window): Document special handling of special-display-*.
(Choosing Window Options): Fix display-buffer-reuse-frames doc.
Don't document even-window-heights, which is going away.  Clarify
which options are obeyed by which action functions.

* src/window.c (Fnext_window, Fprevious_window): Doc fix.