Fix 'notes' typos

s/notes/nodes

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/tools/dtoc/dtb_platdata.py b/tools/dtoc/dtb_platdata.py
index 1f85343..041a331 100644
--- a/tools/dtoc/dtb_platdata.py
+++ b/tools/dtoc/dtb_platdata.py
@@ -197,7 +197,7 @@
         return lines
 
     def scan_dtb(self):
-        """Scan the device tree to obtain a tree of notes and properties
+        """Scan the device tree to obtain a tree of nodes and properties
 
         Once this is done, self._fdt.GetRoot() can be called to obtain the
         device tree root node, and progress from there.