Fix some grammatical errors in native_client_sdk/

native_client_sdk/src/build_tools/debug_server/gdb_rsp/target.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.
  */
 
 
 // This module provides interfaces for accessing the debugging state of
 // the target.  The target can use either the thread that took the
-// exception or run in it's own thread.  To respond to the host, the
+// exception or run in its own thread.  To respond to the host, the
 // application must call the run function with a valid Transport
 // which will then be polled for commands.  The target will return
 // from Run when the host disconnects, or requests a continue.
 //
 // The object is protected by a mutex, so that it is legal to track or
 // ignore threads as an exception takes place.
 //
 // The Run function expects that all threads of interest are stopped
 // with the Step flag cleared before Run is called.  It is expected that
 // and that all threads are updated with thier modified contexts and
@@ skipping 129 matching lines @@
 
   uint32_t run_thread_;   // Which thread to issue step commands on
   uint32_t reg_thread_;   // Which thread to issue context (reg) commands on
 };
 
 
 }  // namespace gdb_rsp
 
 #endif  // NATIVE_CLIENT_GDB_RSP_TARGET_H_