[NaCl SDK] rename nacl_io demo.

native_client_sdk/src/doc/devguide/devcycle/building.rst

 .. _devcycle-building:
 
 ########
 Building
 ########
 
 .. contents:: Table Of Contents
   :local:
   :backlinks: none
   :depth: 2
@@ skipping 571 matching lines @@
   Implements the Pepper (PPAPI) GLES interface. Needed by applications
   that use the 3D graphics API.
 
 libnacl_io.a
   Provides a POSIX layer for NaCl. In particular, the library provides a
   virtual file system and support for sockets. The virtual file system
   allows a module to "mount" a given directory tree. Once a module has
   mounted a file system, it can use standard C library file operations:
   ``fopen``, ``fread``, ``fwrite``, ``fseek``, and ``fclose``.
   For more detail, see the header ``include/nacl_io/nacl_io.h``.
-  For an example of how to use nacl_io, see ``examples/demo/nacl_io``.
+  For an example of how to use nacl_io, see ``examples/demo/nacl_io_demo``.
 
 libppapi_simple.a
   Provides a familiar C programming environment by letting a module have a
   simple entry point that is registered by ``PPAPI_SIMPLE_REGISTER_MAIN``.
   The entry point is similar to the standard C ``main()`` function, complete
   with ``argc`` and ``argv[]`` parameters. For details see
   ``include/ppapi_simple/ps.h``. For an example of
   how to use ppapi_simple, ``see examples/tutorial/using_ppapi_simple``.
 
 
@@ skipping 82 matching lines @@
   Function foo has disallowed type: i128 (i128)
   LLVM ERROR: PNaCl ABI verification failed
 
 When faced with a PNaCl ABI verification error, check the list of features
 that are :ref:`not supported by PNaCl <when-to-use-nacl>`.
 If the problem you face is not listed as restricted,
 :ref:`let us know <help>`!
 
 .. _glibc: http://www.gnu.org/software/libc/
 .. _newlib: http://sourceware.org/newlib/