be more precise about items to copy

be more precise about items to copy to the new friendica folder when upgrading

doc/Update.md

@@ -8,7 +8,13 @@ Updating Friendica
 If you installed Friendica in the ``path/to/friendica`` folder:
 
 1. Unpack the new Friendica archive in ``path/to/friendica_new``.
-2. Copy ``config/local.config.php``, ``photo/`` and ``proxy/`` from ``path/to/friendica`` to ``path/to/friendica_new``.
+2. Copy  the following items from ``path/to/friendica`` to ``path/to/friendica_new``:
+   * ``config/local.config.php``
+   * ``proxy/``   
+The following items only need to be copied if they are located inside your friendica path:
+   * your storage folder as set in **Admin -> Site -> File Upload -> Storage base path** 
+   * your item cache as set in **Admin -> Site -> Performance -> Path to item cache**
+   * your temp folder as set in **Admin -> Site -> Advanced -> Temp path**
 3. Rename the ``path/to/friendica`` folder to ``path/to/friendica_old``.
 4. Rename the ``path/to/friendica_new`` folder to ``path/to/friendica``.
 5. Check your site. Note: it may go into maintenance mode to update the database schema.