Update index.html

Co-authored-by: Addison Phillips <addisonI18N@gmail.com>

index.html

@@ -552,9 +552,9 @@ <h3>
  manifest's [=localizable members=].
  </p>
  <p class="note">
-  Specifying the language can improve the user experience by helping
-  user agents to select appropriate fonts for displaying manifest
-  values or to choose a suitable text-to-speech voice for accessibility.
+ Specifying the language improves the user experience by helping
+ user agents select the most appropriate processing or resources,
+ such as fonts, styling, hyphenation, or text-to-speech voices for accessibility.
  </p>
  <p>
  A <dfn>language tag</dfn> is a <a>string</a> that matches the