spelling fixes

Author: rmisio

index.html

@@ -17,8 +17,8 @@
     <div id="appBar" class="top0 alignCenter custCol-secondary"></div>
 
     <div id="contentFrame">
-      <!-- overlay is used by pageNav drop down menus and should be here i the markup so that it
-           properly aboscures any open modals (without having to manage z-indexes) -->
+      <!-- Overlay is used by pageNav drop down menus and should be here in the markup so that it
+           properly obscures any open modals (without having to manage z-indexes). -->
       <div id="overlay" class="hide"></div>
 
       <div id="navArea">