Doc fixes in window.el functions.

Doc fixes in window.el functions.

 lisp/window.el (window-min-size, window-sizable, window-min-delta)
 (window-max-delta, window--resizable, window-resizable)
 (window-total-size, window-full-height-p, window-full-width-p)
 (window-in-direction, window--resize-mini-window, window-resize)
 (window--resize-child-windows-normal)
 (window--resize-child-windows, window--resize-siblings)
 (window--resize-this-window, adjust-window-trailing-edge)
 (enlarge-window, shrink-window): Doc fixes.