(Fwindow_width, Fset_window_start)

(Fwindow_width, Fset_window_start)
(Fwindow_parameters, Fwindow_parameter, Fset_window_parameter)
(Fdelete_windows_on, Freplace_buffer_in_windows): Make
doc-strings follow code and Elisp manual more closely.
(Fwindow_dedicated_p): Make window argument optional.
(Fset_window_dedicated_p): Rename argument "arg" to "flag".
(Fset_window_buffer): Respect any non-nil dedicated value for
window.  Rename "buffer" argument to "buffer_or_name".