referenced other document in key-map/text editor files

docs/source/user/file_editor.rst

@@ -11,7 +11,7 @@ JupyterLab:
    :class: jp-screenshot
 
 The text editor includes syntax highlighting, configurable indentation
-(tabs or spaces), different key maps (vim, emacs, Sublime Text) and
+(tabs or spaces), :ref:`key maps <shortcuts>` and
 basic theming. These settings can be found in the Settings menu:
 
 .. image:: images/file_editor_settings.png

docs/source/user/interface.rst

@@ -154,7 +154,7 @@ Keyboard Shortcuts in the Settings tab.
        <iframe src="https://www.youtube-nocookie.com/embed/rhW3kAExCik?rel=0&amp;showinfo=0" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
     </div>
 
-You can also customize the text editor to use vim, emacs, or Sublime Text
+You can also customize the :ref:`text editor <file_editor>` to use vim, emacs, or Sublime Text
 keyboard maps by using the Text Editor Key Map submenu in the Settings
 menu: