Provide more details in doc-string of 'delete-windows-on' (Bug#34749)

* lisp/window.el (delete-windows-on): Provide more details in
doc-string (Bug#34749).

lisp/window.el

@@ -4706,9 +4706,21 @@ Interactively, FRAME is the prefix argument, so you can
 use \\[universal-argument] 0 to specify all windows only on
 the current terminal's frames.
 
-When a window showing BUFFER-OR-NAME is dedicated and the only
+If a frame's root window shows the buffer specified by
-window of its frame, that frame is deleted when there are other
+BUFFER-OR-NAME and is dedicated to that buffer and that frame
-frames left."
+does not host the active minibuffer window and there is at least
+one other frame on that frame's terminal, delete that frame.
+Otherwise, do not delete a frame's root window if it shows the
+buffer specified by BUFFER-OR-NAME and do not delete any frame's
+main window showing that buffer either.  Rather, in any such
+case, call `switch-to-prev-buffer' to show another buffer in that
+window and make sure the window is no more dedicated to its
+buffer.
+
+If the buffer specified by BUFFER-OR-NAME is shown in a
+minibuffer window, do nothing for that window.  For any window
+that does not show that buffer, remove the buffer from that
+window's lists of previous and next buffers."
   (interactive "BDelete windows on (buffer):\nP")
   (let ((buffer (window-normalize-buffer buffer-or-name))
 	;; Handle the "inverted" meaning of the FRAME argument wrt other