MdeModulePkg: 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>

MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBus.h

@@ -392,8 +392,8 @@ UsbIoControlTransfer (
   IN  EFI_USB_DEVICE_REQUEST  *Request,
   IN  EFI_USB_DATA_DIRECTION  Direction,
   IN  UINT32                  Timeout,
-  IN  OUT VOID                *Data,      OPTIONAL
-  IN  UINTN                   DataLength, OPTIONAL
+  IN  OUT VOID                *Data       OPTIONAL,
+  IN  UINTN                   DataLength  OPTIONAL,
   OUT UINT32                  *UsbStatus
   );
 
@@ -477,9 +477,9 @@ UsbIoAsyncInterruptTransfer (
   IN EFI_USB_IO_PROTOCOL              *This,
   IN UINT8                            Endpoint,
   IN BOOLEAN                          IsNewTransfer,
-  IN UINTN                            PollInterval,       OPTIONAL
-  IN UINTN                            DataLength,         OPTIONAL
-  IN EFI_ASYNC_USB_TRANSFER_CALLBACK  Callback,           OPTIONAL
+  IN UINTN                            PollInterval        OPTIONAL,
+  IN UINTN                            DataLength          OPTIONAL,
+  IN EFI_ASYNC_USB_TRANSFER_CALLBACK  Callback            OPTIONAL,
   IN VOID                             *Context            OPTIONAL
   );