Fix typos in the 'who uses FreeBSD page'

Add voxer to the list of those who use FreeBSD

PR:		193599
Approved by:	bcr (mentor)
Sponsored by:	ScaleEngine Inc.

en_US.ISO8859-1/books/handbook/introduction/chapter.xml

@@ -558,7 +558,7 @@
 	      <primary>Netflix</primary>
 	    </indexterm> - The OpenConnect appliance that Netflix
 	    uses to stream movies to its customers is based on &os;.
-	    Netflix has make extensive contributions to the codebase
+	    Netflix has made extensive contributions to the codebase
 	    and works to maintain a zero delta from mainline &os;.
 	    Netflix OpenConnect appliances are responsible for
 	    delivering more than 32% of all Internet traffic in North
@@ -632,6 +632,21 @@
 	    infrastructure.</para>
 	</listitem>
 
+	<listitem>
+	  <para><link
+	      xlink:href="http://www.voxer.com/">Voxer</link>
+	    <indexterm>
+	      <primary>Voxer</primary>
+
+	    </indexterm> - Voxer powers their mobile voice messaging
+	    platform with ZFS on &os;.  Voxer switched from a Solaris
+	    derivative to &os; because of its superior documentation,
+	    larger and more active community, and more developer
+	    friendly environment.  In addition to critical features
+	    like <acronym>ZFS</acronym> and DTrace, &os; also offers
+	    TRIM support for <acronym>ZFS</acronym>.</para>
+	</listitem>
+
 	<listitem>
 	  <para><link
 	      xlink:href="http://www.whatsapp.com/">WhatsApp</link>
@@ -847,7 +862,7 @@
 
       <para>and many more.  Wikipedia also maintains a <link
 	  xlink:href="http://en.wikipedia.org/wiki/List_of_products_based_on_FreeBSD">list
-	  of products based on &os;</link></para>
+	  of products based on &os;</link>.</para>
     </sect2>
   </sect1>