[PPAPI] Documentation fixes.

ppapi/cpp/graphics_3d.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 PPAPI_CPP_GRAPHICS_3D_H_
 #define PPAPI_CPP_GRAPHICS_3D_H_
 
 #include "ppapi/c/ppb_graphics_3d.h"
 #include "ppapi/cpp/resource.h"
 
@@ skipping 91 matching lines @@
   /// <code>PP_GRAPHICS3DATTRIB_NONE</code>.
   ///
   /// The following error codes may be returned on failure:
   ///
   /// PP_ERROR_BADRESOURCE if context is invalid.
   /// PP_ERROR_BADARGUMENT if <code>attrib_list</code> is NULL or any attribute
   /// in the <code>attrib_list</code> is not a valid attribute.
   ///
   /// <strong>Example:</strong>
   ///
-  /// <code>
+  /// @code
   /// int attrib_list[] = {PP_GRAPHICS3DATTRIB_RED_SIZE, 0,
   ///                      PP_GRAPHICS3DATTRIB_GREEN_SIZE, 0,
   ///                      PP_GRAPHICS3DATTRIB_BLUE_SIZE, 0,
   ///                      PP_GRAPHICS3DATTRIB_NONE};
   /// GetAttribs(context, attrib_list);
   /// int red_bits = attrib_list[1];
   /// int green_bits = attrib_list[3];
   /// int blue_bits = attrib_list[5];
-  /// </code>
+  /// @endcode
   ///
   /// This example retrieves the values for rgb bits in the color buffer.
   int32_t GetAttribs(int32_t attrib_list[]) const;
 
   /// SetAttribs() sets the values for each attribute in
   /// <code>attrib_list</code>. The list has the same structure as the list
   /// used in the constructors.
   ///
   /// Attributes that can be specified are:
   /// - PP_GRAPHICS3DATTRIB_SWAP_BEHAVIOR
@@ skipping 52 matching lines @@
   ///
   /// @return An int32_t containing <code>PP_ERROR_BADRESOURCE</code> if
   /// context is invalid or <code>PP_ERROR_BADARGUMENT</code> if callback is
   /// invalid.
   int32_t SwapBuffers(const CompletionCallback& cc);
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_GRAPHICS_3D_H_