Fix url of ulink to point to mate-user-guide

Author: rbuj

help/C/index.docbook

@@ -577,7 +577,7 @@
 			<guimenuitem>Move to Trash</guimenuitem>
 			</menuchoice>.
 			This moves the file to the Trash folder. Multiple images can also be moved to the trash in the same way: select them all first.</para>
-	    <para>To restore an image from the Trash, open the Trash folder in <application>Caja</application> file manager and move the image file to another folder. To delete the image permanently, empty the Trash. To find out more about using the Trash, see the <ulink type="help" url="help:user-guide?caja-trash">User Guide</ulink>.</para>
+	    <para>To restore an image from the Trash, open the Trash folder in <application>Caja</application> file manager and move the image file to another folder. To delete the image permanently, empty the Trash. To find out more about using the Trash, see the <ulink type="help" url="help:mate-user-guide/caja-trash">Desktop User Guide</ulink>.</para>
 
 			<note><para>You can also use the <keycap>Del</keycap> key to move an image to the Trash, in which case you will be asked for confirmation.</para></note>