added additional comments and fixed some typo.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5810 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/Pi/PiFirmwareFile.h

@@ -1,7 +1,7 @@
 /** @file
   The firmware file related definitions in PI.
 
-  Copyright (c) 2006 - 2007, Intel Corporation                                                         
+  Copyright (c) 2006 - 2008, Intel Corporation                                                         
   All rights reserved. This program and the accompanying materials                          
   are licensed and made available under the terms and conditions of the BSD License         
   which accompanies this distribution.  The full text of the license may be found at        
@@ -225,6 +225,10 @@ typedef struct {
 typedef struct {
   EFI_COMMON_SECTION_HEADER   CommonHeader;
   UINT16                      BuildNumber;
+
+  ///
+  /// Array of unicode string.
+  /// 
   CHAR16                      VersionString[1];
 } EFI_VERSION_SECTION;