Update index.html

Co-authored-by: Marcos Cáceres <marcos@marcosc.com>

index.html

@@ -554,7 +554,7 @@ <h3>
  <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 the right text-to-speech voice for accessibility.
+ values or to choose a suitable text-to-speech voice for accessibility.
  </p>
  <p>
  A <dfn>language tag</dfn> is a <a>string</a> that matches the