Use doxygen comment style for document entity such as struct, enum, variable that use /// but not //

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5645 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/IndustryStandard/Mbr.h

@@ -46,9 +46,9 @@ typedef struct {
   UINT8 SizeInLBA[4];
 } MBR_PARTITION_RECORD;
 
-//
-// MBR Partition table
-//
+///
+/// MBR Partition table
+///
 typedef struct {
   UINT8                 BootStrapCode[440];
   UINT8                 UniqueMbrSignature[4];