Spelling fix to kick off more builds. CLOSED TREE a=me

dom/tests/mochitest/dom-level2-html/test_HTMLBodyElement02.html

@@ -69,7 +69,7 @@ function loadComplete() {
 
 /**
 * 
-    The background attribute specifies the URI fo the background texture
+    The background attribute specifies the URI of the background texture
     tile image. 
 
     Retrieve the background attribute and examine its value.