Update MN_SET comment

Fixes #169 (most of it has been already done by Thorsten Otto).

gem/aes/menu_/menu_popup.ui

@@ -37,8 +37,8 @@ If (!I)mn_scroll(!i) of MENU is set to 0 when menu_popup is called, a
 non-scrollable popup menu will be displayed.
 
 if (!I)mn_scroll(!i) of MENU is set to >0 when menu_popup is called, a
-scrolling popup menu will be displayed; height of MN_SET determines
-it's height in items (note that Atari's AES implements up/down arrows
+scrolling popup menu will be displayed; (!I)height(!i) of MN_SET determines
+it's height in items (note that Atari's (!nolink [AES]) implements up/down arrows
 within the popup for scrolling to maintain the same look and feel of
 dropdown menus as they can be attached to menubar items, note that NAES
 mimics this exact behavior). See also menu_settings.

gem/aes/structures/mn_set.ui

@@ -5,11 +5,12 @@
 !begin_verbatim
 typedef struct
 {
-    int32_t display;    /* Submenu display delay          */
-    int32_t drag;       /* Submenu drag delay             */
-    int32_t delay;      /* Single-click scroll delay      */
-    int32_t speed;      /* Continuous scroll delay        */
-    int16_t height;     /* Menu scroll height (in items)  */
+    int32_t display;    /* Submenu display delay                  */
+    int32_t drag;       /* Submenu drag delay                     */
+    int32_t delay;      /* Single-click scroll delay              */
+    int32_t speed;      /* Continuous scroll delay                */
+    int16_t height;     /* Menu scroll height (in items)          */
+                        /* (applied when (!I)mn_scroll(!i) of MENU is >0) */
 } MN_SET;
 !end_verbatim