* lisp/doc-view.el (doc-view-mode-map): Bind k to image-kill-buffer.
The binding k -> doc-view-kill-proc-and-buffer has been removed in
2015 and the function been made an obsolete function alias to
image-kill-buffer (bug#45157).
(define-key map "P" 'doc-view-fit-page-to-window)
(define-key map "F" 'doc-view-fit-window-to-page) ;F = frame
;; Killing the buffer (and the process)
+ (define-key map (kbd "k") 'image-kill-buffer)
(define-key map (kbd "K") 'doc-view-kill-proc)
;; Slicing the image
(define-key map (kbd "c s") 'doc-view-set-slice)