Update shortcuts.md

Shortcuts list UI usability #17821

content/preferences-settings/shortcuts.md

@@ -113,7 +113,7 @@ Finally, if you scroll with your mouse wheel while in visual mapping mode (witho
 
 The most flexible way to create shortcuts is by using the shortcut mapping screen, which can be accessed from the global preferences dialog or by left-clicking in visual mapping mode. This screen allows access to all available actions, including some that are not directly linked to a UI widget.
 
-The top panel of the shortcut mapping screen shows a list of available UI widgets/actions and the bottom panel shows the shortcuts currently assigned to them. You can search the top and bottom panels using the text entry boxes at the bottom of the screen (use the up/down arrow keys to navigate between matches).
+The top panel of the shortcut mapping screen shows a list of available UI widgets/actions and the bottom panel shows the shortcuts currently assigned to them. You can search the top and bottom panels using the text entry boxes at the bottom of the screen (use the up/down arrow keys to navigate between matches). Fields that can be changed by user action are shown in bold. 
 
 Double-click an item in the top panel to create a new shortcut for that item, and then enter your desired shortcut (right-click to cancel). Once you have done this, a new entry will appear in the bottom panel showing the shortcut you have created. You can then manually alter the _element_, _effect_, _speed_ or _instance_ of the assigned action against that shortcut in the bottom panel. To delete a user-defined shortcut, select it in the bottom panel and press the Delete key.