Doc change: edits to distribute content.

Change-Id: Ief68326428be5fc94060daca664b062e0af1f9df

Author: ddougherty

docs/html/distribute/googleplay/about/visibility.jd

@@ -16,7 +16,7 @@ of users at Google's scale. </p>
 <p>Google Play is the premier store for distributing Android apps. It’s
 preinstalled on more than 400 million devices worldwide, a number growing by
 more than a million every day. Android users have downloaded
-more than <strong style="text-wrap:none;">15 billion apps</strong> from Google
+more than <strong style="text-wrap:none;">25 billion apps</strong> from Google
 Play, growing at a rate of more than 1.5 billion per month.</p>
 
 <p>When you publish on Google Play, you put your apps in front of Android's huge