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/UsbBusPei/UsbIoPeim.c

@@ -38,7 +38,7 @@ PeiUsbControlTransfer (
   IN     EFI_USB_DEVICE_REQUEST    *Request,
   IN     EFI_USB_DATA_DIRECTION    Direction,
   IN     UINT32                    Timeout,
-  IN OUT VOID                      *Data,      OPTIONAL
+  IN OUT VOID                      *Data       OPTIONAL,
   IN     UINTN                     DataLength  OPTIONAL
   )
 {