updated guide to match plugin interface (thanks Guss der Kinderen)

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@2825 b35dd754-fafc-0310-a699-88a17e54d16e

documentation/docs/plugin-dev-guide.html

@@ -128,11 +128,11 @@ import java.io.File;
  */
 public class ExamplePlugin implements Plugin {
 
-    public void initialize(PluginManager manager, File pluginDirectory) {
+    public void initializePlugin(PluginManager manager, File pluginDirectory) {
         <span class="comment">// Your code goes here</span>
     }
 
-    public void destroy() {
+    public void destroyPlugin() {
         <span class="comment">// Your code goes here</span>
     }
 }