Updated FAQ Keymap (markdown)

FAQ-Keymap.md

@@ -214,4 +214,8 @@ const uint16_t PROGMEM fn_actions[] = {
 ```
 
 
-Dual-role key: https://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys
+Dual-role key: https://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys
+
+
+## Eject on Mac OSX
+It is actually F20, at least HHKB use it for Eject key(Fn+f).