ev/book.xml: add the missing dot character

Author: mmalferov

reference/ev/book.xml

@@ -32,9 +32,7 @@
   </para>
   <para>
    For details refer to the
-   <link
- xlink:href="http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod">documentation
- of libev</link>
+   <link xlink:href="http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod">documentation of libev</link>.
   </para>
  </preface>