UefiPayloadPkg: 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: Ray Ni <ray.ni@intel.com>

UefiPayloadPkg/PayloadLoaderPeim/PayloadLoaderPeim.c

@@ -38,8 +38,8 @@ EFIAPI
 PeiLoadFileLoadPayload (
   IN     CONST EFI_PEI_LOAD_FILE_PPI  *This,
   IN     EFI_PEI_FILE_HANDLE          FileHandle,
-  OUT    EFI_PHYSICAL_ADDRESS         *ImageAddressArg,  OPTIONAL
-  OUT    UINT64                       *ImageSizeArg,     OPTIONAL
+  OUT    EFI_PHYSICAL_ADDRESS         *ImageAddressArg   OPTIONAL,
+  OUT    UINT64                       *ImageSizeArg      OPTIONAL,
   OUT    EFI_PHYSICAL_ADDRESS         *EntryPoint,
   OUT    UINT32                       *AuthenticationState
   )