Added link to ppb.h to point to list of valid interface names. Wrote/rewrote ...

ppapi/c/ppb.h

 /* Copyright (c) 2010 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 PPAPI_C_PPB_H_
 #define PPAPI_C_PPB_H_
 
 /**
  * @file
  * This file defines a function pointer type for the PPB_GetInterface function.
  */
 
 /**
  * @addtogroup Typedefs
  * @{
  */
 
 /**
  * This function pointer type defines the signature for the PPB_GetInterface
  * function. A generic PPB_GetInterface pointer is passed to
  * PPP_InitializedModule when your module is loaded. You can use this pointer
  * to request a pointer to a specific browser interface. Browser interface
  * names are ASCII strings and are generally defined in the header file for the
  * interface, such as PP_AUDIO_INTERFACE found in ppb.audio.h or
- * PPB_GRAPHICS_2D_INTERFACE in ppb_graphics_2d.h.
+ * PPB_GRAPHICS_2D_INTERFACE in ppb_graphics_2d.h. Click
+ * <a href="http://code.google.com/chrome/nativeclient/docs/reference/pepperc/
+ *globals_defs.html" title="macros">here</a> for a complete list of interface
+ * names.
  *
  * This value will be NULL if the interface is not supported on the browser.
  */
 typedef const void* (*PPB_GetInterface)(const char* interface_name);
 /**
  * @}
  */
 #endif  /* PPAPI_C_PPB_H_ */