[PPAPI] Fix a bunch of spelling mistakes

ppapi/cpp/var_array_buffer.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_VAR_ARRAY_BUFFER_H_
 #define PPAPI_CPP_VAR_ARRAY_BUFFER_H_
 
 #include "ppapi/cpp/var.h"
 
 /// @file
 /// This file defines the API for interacting with a JavaScript ArrayBuffer.
 
 namespace pp {
 
 /// <code>VarArrayBuffer</code> provides a way to interact with JavaScript
 /// ArrayBuffers, which represent a contiguous sequence of bytes. Note that
 /// these vars are not part of the embedding page's DOM, and can only be
 /// shared with JavaScript using the <code>PostMessage</code> and
 /// <code>HandleMessage</code> functions of <code>Instance</code>.
 class VarArrayBuffer : public Var {
  public:
-  /// Contruct a <code>VarArrayBuffer</code> given a var for which
+  /// Construct a <code>VarArrayBuffer</code> given a var for which
   /// is_array_buffer() is true. This will refer to the same
   /// <code>ArrayBuffer</code> as var, but allows you to access methods
   /// specific to <code>VarArrayBuffer</code>.
   ///
   /// @param[in] var An <code>ArrayBuffer</code> var.
   explicit VarArrayBuffer(const Var& var);
 
   /// Construct a new <code>VarArrayBuffer_Dev</code> which is
   /// <code>size_in_bytes</code> bytes long and initialized to zero.
   ///
@@ skipping 55 matching lines @@
 
   /// Unmap() unmaps this <code>ArrayBuffer</code> var from the module address
   /// space. Use this if you want to save memory but might want to call Map()
   /// to map the buffer again later.
   void Unmap();
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_VAR_ARRAY_BUFFER_H_