Fixing second sentence

Author: dmurph

index.html

@@ -2413,13 +2413,12 @@ <h2>
       <p>
         An <dfn class="export">installable web application</dfn> is a website
         with an [=applied=] [=manifest=], with an [=manifest/identity=] and
-        [=manifest/navigation scope|scope=]. A common use case of a manifest is
-        for a user agent to <dfn data-local-lt="installing|installation"
-        data-lt="installed">install</dfn> a installable web application;
-        whereby the user agent provides the end-user with a means of
-        instantiating a new <a>top-level browsing context</a> that has the
-        manifest's members <a>applied</a> to it. An installable web application
-        that is installed is known as a <dfn data-export="">installed web
+        [=manifest/navigation scope|scope=]. A user agent can provide a way for
+        the end-user to <dfn data-local-lt="installing|installation" data-lt=
+        "installed">install</dfn> an installable web application, allowing the
+        user to instantiate a new top-level browsing context with the
+        manifest's members applied. An installable web application that is
+        installed is known as a <dfn data-export="">installed web
         application</dfn>. That is, the manifest's members, or their defaults,
         are in effect on the <a>top-level browsing context</a>. This
         distinguishes an installed web application from a traditional bookmark,