chore: export Installed Web Application Identity

Author: marcoscaceres

index.html

@@ -863,8 +863,10 @@ <h3>
         <p>
           The [=manifest's=] <code><dfn data-export="" data-dfn-for=
           "manifest">id</dfn></code> member is a <a>string</a> that represents
-          the <dfn>identity</dfn> for the application. The [=identity=] takes
-          the form of a URL, which is same origin as the [=start URL=].
+          the <dfn class="export" data-dfn-for=
+          "installed web application">identity</dfn> for the application. The
+          [=identity=] takes the form of a URL, which is same origin as the
+          [=start URL=].
         </p>
         <p>
           The [=identity=] is used by user agents to uniquely identify the