bug#22210: 25.0.50; display-message-or-buffer docstring refers to wrong argument in display-buffer

[Sebastian Wiesner]

The docstring of `display-message-or-buffer' reads as follows:

----

(display-message-or-buffer MESSAGE &optional BUFFER-NAME NOT-THIS-WINDOW FRAME)

[…]

Optional arguments NOT-THIS-WINDOW and FRAME are as for ‘display-buffer’,
and only used if a buffer is displayed.

----

However, display-buffer does not actually have a NOT-THIS-WINDOW argument:

(display-buffer BUFFER-OR-NAME &optional ACTION FRAME)

The source of display-message-or-buffer reveals that NOT-THIS-WINDOW is 
actually 
passed in the ACTION argument.

I think the argument of display-message-or-buffer should be renamed to ACTION 
as well. Currently it's pretty confusing and may lead to wrong guesses about
the semantics of this argument.

Greetings,
Sebastian