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/Library/UefiBootManagerLib/BmDriverHealth.c

@@ -192,7 +192,7 @@ BmGetSingleControllerHealthStatus (
   IN OUT EFI_BOOT_MANAGER_DRIVER_HEALTH_INFO **DriverHealthInfo,
   IN OUT UINTN                               *Count,
   IN  EFI_HANDLE                             DriverHealthHandle,
-  IN  EFI_HANDLE                             ControllerHandle,  OPTIONAL
+  IN  EFI_HANDLE                             ControllerHandle   OPTIONAL,
   IN  EFI_HANDLE                             ChildHandle        OPTIONAL
   )
 {