docs: correct keybinding example with new in v1.3

docs/org-remark.org

@@ -1,7 +1,7 @@
 #+title: Org-remark User Manual
 #+author: Noboru Ota <[email protected]>
 #+macro: version 1.3.x
-#+macro: modified 07 October 2023
+#+macro: modified 01 February 2024
 #+language: en
 #+export_file_name: org-remark.texi
 #+texinfo_dir_category: Emacs
@@ -86,6 +86,7 @@ Below are example keybindings you might like to consider:
   ;; globally before the library is loaded.
 
   (define-key global-map (kbd "C-c n m") #'org-remark-mark)
+  (define-key global-map (kbd "C-c n l") #'org-remark-mark-line) ; new in v1.3
 
   ;; The rest of keybidings are done only on loading `org-remark'
   (with-eval-after-load 'org-remark
@@ -106,7 +107,7 @@ Alternatively, you can use ~use-package~ to set up Org-remark. The example provi
     :bind (;; :bind keyword also implicitly defers org-remark itself.
            ;; Keybindings before :map is set for global-map.
            ("C-c n m" . org-remark-mark)
-           ("C-c n l" . org-remark-mark-line)
+           ("C-c n l" . org-remark-mark-line) ; new in v1.3
            :map org-remark-mode-map
            ("C-c n o" . org-remark-open)
            ("C-c n ]" . org-remark-view-next)