Apply suggestions from code review

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

index.html

@@ -3558,7 +3558,7 @@ <h2>
         </dt>
         <dd>
           Authors can provide [=localized values=] for the [=localizable
-          members=] of the [=manifest=]. The user agent should pass all
+          members=] of the [=manifest=]. The user agent passes all
           localized values to the host operating system. When the user changes
           the [=locale=] at the OS level, the OS can present the
           updated localized values of the [=installed web application=].