Fix #214 - Explicitly note spacebar key cap.

sections/event-types.txt

@@ -2930,7 +2930,7 @@ myDiv.addEventListener("auxclick", function(e) {
 				(if any) to the new focused element, as described in
 				<a href="#events-focusevent">Focus Event Types</a>
 
-			*	If the key is the KEYCAP{Enter} or KEYCAP{&nbsp;} key and the
+			*	If the key is the KEYCAP{Enter} or KEYCAP{&nbsp;} (Space) key and the
 				current focus is on a state-changing element, the default action
 				MUST be to dispatch a EVENT{click} event, and a
 				EVENT{DOMActivate} event if that event type is supported by the