Update index.html

index.html

@@ -1079,7 +1079,7 @@ <h3>
           member as the [=default theme color=], then that color serves as the
           [=theme color=] for all [=browsing contexts=] to which the manifest is
           [=applied=]. However, the user agent MAY override the [=default theme
-          color=] if a document whose URL is [=URL/within scope=] of the
+          color=] if a [=document=] whose [=Document/URL=] is [=URL/within scope=] of the
           [=application context=]'s [=manifest=] includes a [^meta^] element
           whose [^meta/name^] attribute is "[^meta/name/theme-color^]".
           However, the user agent SHOULD NOT override the [=default theme