Document correct sequence of hooks in node deletion

Documentation states:

> This hook is invoked from node_delete_multiple() after the node has been removed from the node table in the database, after the type-specific hook_delete() has been invoked, and before field_attach_delete() is called.

However, as #921944: error messages on tracker page - tracker_node_delete() does not correctly act on node deletion shows, the above is not true. The following code in tracker module still retrieves a node:

$node = db_query('SELECT nid, status, uid, changed FROM {node} WHERE nid = :nid', array(':nid' => $nid))->fetchObject();

The code in node.module confirms this:

        // Call the node-specific callback (if any):
        node_invoke($node, 'delete');
        module_invoke_all('node_delete', $node);
        module_invoke_all('entity_delete', $node, 'node');
        field_attach_delete('node', $node);

        // Remove this node from the search index if needed.
        // This code is implemented in node module rather than in search module,
        // because node module is implementing search module's API, not the other
        // way around.
        if (module_exists('search')) {
          search_reindex($nid, 'node');
        }
      }

      // Delete after calling hooks so that they can query node tables as needed.

Marking as major as this has implications for all implementing modules, and I've no idea which of the code or docs is correct...