SEC-2282: Polish CSRF doc

Author: rwinch

docs/manual/src/docbook/csrf.xml

@@ -31,7 +31,7 @@ amount=100.00&routingNumber=1234&account=9876
  name="account"
  value="evilsAccountNumber"/>
  <input type="submit"
- value="Win Money!'/>
+ value="Win Money!"/>
 </form>]]></programlisting>
  <para>You like to win money, so you click on the submit button. In the process, you have unintentionally transferred $100 to
  a malicious user. This happens because, while the evil website cannot see your cookies, the cookies associated with your