Fix spelling of "NaCl" in various places: "NaCL" is the wrong capitalisation

native_client_sdk/src/libraries/nacl_io/nacl_io.h

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 #ifndef LIBRARIES_NACL_IO_NACL_IO_H_
 #define LIBRARIES_NACL_IO_NACL_IO_H_
 
 #include <ppapi/c/pp_instance.h>
 #include <ppapi/c/ppb.h>
 
@@ skipping 81 matching lines @@
  *       "allow_cross_origin_requests": If "true", then reads from this
  *           filesystem will follow the CORS standard for cross-origin requests.
  *           See http://www.w3.org/TR/access-control.
  *       "allow_credentials": If "true", credentials are sent with cross-origin
  *           requests. If false, no credentials are sent with the request and
  *           cookies are ignored in the response.
  *       All other key/value pairs are assumed to be headers to use with
  *       HTTP requests.
  *
  *   "passthroughfs": A filesystem that passes all requests through to the
- *                    underlying NaCL calls. The primary use of this filesystem
+ *                    underlying NaCl calls. The primary use of this filesystem
  *                    is to allow reading NMF resources.
  *     source: Unused.
  *     data: Unused.
  *
  *
  * @param[in] source Depends on the filesystem type. See above.
  * @param[in] target The absolute path to mount the filesystem.
  * @param[in] filesystemtype The name of the filesystem type to mount. See
  *     above for examples.
  * @param[in] mountflags Unused.
  * @param[in] data Depends on the filesystem type. See above.
  * @return 0 on success, -1 on failure (with errno set).
  *
  * int mount(const char* source, const char* target, const char* filesystemtype,
  *         unsigned long mountflags, const void *data) NOTHROW;
  */
 
 EXTERN_C_END
 
 #endif  /* LIBRARIES_NACL_IO_NACL_IO_H_ */