Update index.html

Co-authored-by: Christian Liebel <[email protected]>

Author: marcoscaceres

index.html

@@ -1083,7 +1083,7 @@ <h3>
           [=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
-          color=] via an [^meta^] element whose [^meta/name^] attribute is
+          color=] via a [^meta^] element whose [^meta/name^] attribute is
           "theme-color" for [=documents=]' [=Document/URL=] are not [=URL/within scope=], since the
           application has no control over these documents.
         </p>