MdePkg: Change OPTIONAL keyword usage style

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3760

Update all use of ', OPTIONAL' to ' OPTIONAL,' for function params.

Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>

MdePkg/Include/Protocol/HiiDatabase.h

@@ -103,7 +103,7 @@ EFI_STATUS
 (EFIAPI *EFI_HII_DATABASE_NEW_PACK)(
   IN CONST  EFI_HII_DATABASE_PROTOCOL   *This,
   IN CONST  EFI_HII_PACKAGE_LIST_HEADER *PackageList,
-  IN        EFI_HANDLE                  DriverHandle, OPTIONAL
+  IN        EFI_HANDLE                  DriverHandle  OPTIONAL,
   OUT       EFI_HII_HANDLE               *Handle
 );
 
@@ -524,5 +524,3 @@ struct _EFI_HII_DATABASE_PROTOCOL {
 extern EFI_GUID gEfiHiiDatabaseProtocolGuid;
 
 #endif
-
-