SEC-2269: Fix markup for CSRF link

Author: rwinch

docs/manual/src/docbook/appendix-namespace.xml

@@ -521,7 +521,7 @@
  </section>
  <section xml:id="nsa-csrf">
  <title><literal>&lt;csrf&gt;</literal></title>
- <para>This element will add <link xlink:href="http://en.wikipedia.org/wiki/Cross-site_request_forgery">Cross Site Request Forger (CSRF)</a>
+ <para>This element will add <link xlink:href="http://en.wikipedia.org/wiki/Cross-site_request_forgery">Cross Site Request Forger (CSRF)</link>
  protection to the application. It also updates the default RequestCache
  to only replay "GET" requests upon successful authentication.</para>
  <section xml:id="nsa-csrf-parents">