[PATCH]Documentation/rbtree.txt: cleanup kerneldoc of rbtree

[fzhang <figo.zhang@kolorific.com>]

The first parameter of the rb_link_node() is a pointer, and the "node"
is
define a struct (pls see line 67 and line 73 in the doc), so should use
"&data->node".

Signed-off-by: Figo.zhang <figo1802@126.com>
---
diff --git a/Documentation/rbtree.txt b/Documentation/rbtree.txt
index 7224459..7710214 100644
--- a/Documentation/rbtree.txt
+++ b/Documentation/rbtree.txt
@@ -131,8 +131,8 @@ Example:
       }
 
       /* Add new node and rebalance tree. */
-      rb_link_node(data->node, parent, new);
-      rb_insert_color(data->node, root);
+      rb_link_node(&data->node, parent, new);
+      rb_insert_color(&data->node, root);
 
     return TRUE;
   }
@@ -146,10 +146,10 @@ To remove an existing node from a tree, call:
 
 Example:
 
-  struct mytype *data = mysearch(mytree, "walrus");
+  struct mytype *data = mysearch(&mytree, "walrus");
 
   if (data) {
-      rb_erase(data->node, mytree);
+      rb_erase(&data->node, &mytree);
       myfree(data);
   }