E_showMenu reference: tweak re Bangle 2 specifics

libs/banglejs/jswrap_bangle.c

@@ -5904,8 +5904,11 @@ On Bangle.js there are a few additions over the standard `graphical_menu`:
     menu is removed
   * (Bangle.js 2) `scroll : int` - an integer specifying how much the initial
     menu should be scrolled by
-  * `onchange : function(value, touch) {}` - on Bangle.js 2 this function can
-    consider ~how~ the entry was touched. See `E.showScroller` for more info.
+* (Bangle.js 2) The mapped functions can consider the current state of the
+  internal scroller and the touch event that interacted with the entry:
+  `"Entry" : function(scroller, touch) { ... }`
+  * This is also true of `onchange` mapped functions in entry objects:
+    `onchange : (value, scroller, touch) => { ... }`
 * The object returned by `E.showMenu` contains:
   * (Bangle.js 2) `scroller` - the object returned by `E.showScroller` -
     `scroller.scroll` returns the amount the menu is currently scrolled by