[NaCl SDK] rename nacl_io demo.

native_client_sdk/src/doc/devguide/coding/nacl_io.rst

 .. _nacl_io:
 
 ###################
 The nacl_io Library
 ###################
 
 .. contents::
   :local:
   :backlinks: none
   :depth: 2
@@ skipping 62 matching lines @@
 
 The demo application launches a Native Client module that mounts three file
 systems and displays a set of controls that let you work with them:
 
 .. image:: /images/nacl_io1.png
 
 Follow these steps to build and run the demo:
 
 * Open a terminal in the demo directory::
 
-    $ cd $NACL_SDK_ROOT/examples/demo/nacl_io
+    $ cd $NACL_SDK_ROOT/examples/demo/nacl_io_demo
 
 * run the demo::
 
     $ make run
 
 Once the demo is running, try these operations:
 
 #. select the fopen command (when you select a command the fields in the line
    below will change according to the command)
 #. type in the filename ``/persistent/test``
@@ skipping 115 matching lines @@
 
     *output = PrintfToNewString("fwrite\1%s\1%d", file_index_string,
                                 bytes_written);
     return 0;
   }
 
 Reference information
 =====================
 
 The example discussed here is included in the SDK in the directory
-``examples/demo/nacl_io``.
+``examples/demo/nacl_io_demo``.
 
 The nacl_io library is included in the SDK toolchain and is not a part of the
 Pepper API. For reference information related to the nacl_io interface see
 its header file in the SDK directory, located at
 ``include/nacl_io/nacl_io.h``.
 
 For more about the HTML5 file system read the `specification
 <http://dev.w3.org/2009/dap/file-system/pub/FileSystem/>`_.