Spelling corrections to the API header file

runtime/include/dart_api.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
  *
  * Dart is a class-based programming language for creating structured
@@ skipping 1429 matching lines @@
     char* as_string;
     struct {
       int length;
       Dart_CObject** values;
     } as_array;
   } value;
 };
 
 /**
  * Posts a message on some port. The message will contain the
- * Dart_CObject object graph rooted in the provided Dart_CObject.
+ * Dart_CObject object graph rooted in 'message'.
  *
  * While the message is being sent the state of the graph of
- * Dart_CObject structures rooted in message should not be accessed,
- * as the message generation will make temporaly modification to the
+ * Dart_CObject structures rooted in 'message' should not be accessed,
+ * as the message generation will make temporary modifications to the
  * data. When the message has been sent the graph will be fully
  * restored.
  *
  * \param port_id The destination port.
  * \param message The message to send.
  *
  * \return True if the message was posted.
  */
-DART_EXPORT bool Dart_PostCObject(Dart_Port port_id, Dart_CObject* root);
+DART_EXPORT bool Dart_PostCObject(Dart_Port port_id, Dart_CObject* message);
 
 #endif  // INCLUDE_DART_API_H_