doc(marketplace): Update the link to the document (#111)

Author: MyvTsv

treeview.xml

@@ -17,7 +17,7 @@
       <homepage>https://github.com/pluginsGLPI/treeview</homepage>
       <download>https://github.com/pluginsGLPI/treeview/releases</download>
       <issues>https://github.com/pluginsGLPI/treeview/issues</issues>
-      <readme>https://github.com/pluginsGLPI/treeview/wiki</readme>
+      <readme>https://help.glpi-project.org/doc-plugins/treeview</readme>
    <authors>
       <author>Xavier Caillaud</author>
       <author>Hussein AL-Rubeiy</author>