correct 0X to 0x

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6912 6f19259b-4bc3-4df7-8a09-765794883524
diff --git a/MdePkg/Include/Library/PrintLib.h b/MdePkg/Include/Library/PrintLib.h
index 1b3fa1e..d908898 100644
--- a/MdePkg/Include/Library/PrintLib.h
+++ b/MdePkg/Include/Library/PrintLib.h
@@ -76,7 +76,7 @@
         to be an int.  This does not follow ANSI C.

     - X

       - The argument is a hexadecimal number and the number is padded with 

-        zeros.  This is equivalent to a format string of "0X". If the flag 

+        zeros.  This is equivalent to a format string of "0x". If the flag 

         'L' is not specified, then the argument is assumed to be an int.  

         This does not follow ANSI C.

     - d