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/HttpUtilities.h

@@ -60,11 +60,11 @@ EFI_STATUS
 (EFIAPI *EFI_HTTP_UTILS_BUILD) (
   IN  EFI_HTTP_UTILITIES_PROTOCOL  *This,
   IN  UINTN                        SeedMessageSize,
-  IN  VOID                         *SeedMessage,   OPTIONAL
+  IN  VOID                         *SeedMessage    OPTIONAL,
   IN  UINTN                        DeleteCount,
-  IN  CHAR8                        *DeleteList[],  OPTIONAL
+  IN  CHAR8                        *DeleteList[]   OPTIONAL,
   IN  UINTN                        AppendCount,
-  IN  EFI_HTTP_HEADER              *AppendList[],  OPTIONAL
+  IN  EFI_HTTP_HEADER              *AppendList[]   OPTIONAL,
   OUT UINTN                        *NewMessageSize,
   OUT VOID                         **NewMessage
   );