Resolve issue about metaKey on different platforms.
This uses language similar to the W3C DOM Level 2 Events spec.
--- a/touchevents.html	Tue Mar 29 16:44:40 2011 -0700
+++ b/touchevents.html	Tue Mar 29 16:57:25 2011 -0700
@@ -176,9 +176,7 @@
         </dd>
         <dt>readonly attribute boolean metaKey</dt>
         <dd>
-          <code>true</code> if the meta (Meta) key modifier is activated; otherwise <code>false</code>
-
-          <p class="issue" id="issue-units"><strong>Issue:</strong> Should a exception be mentioned for platforms/user agents that are missing meta key support?</p>
+          <code>true</code> if the meta (Meta) key modifier is activated; otherwise <code>false</code>.  On some platforms this attribute may map to a differently-named key modifier.
         </dd>
         <dt>readonly attribute boolean ctrlKey</dt>
         <dd>