SecurityPkg: 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: Jian J Wang <jian.j.wang@intel.com>

SecurityPkg/Library/AuthVariableLib/AuthService.c

@@ -1183,9 +1183,9 @@ FindCertsFromDb (
   IN     EFI_GUID         *VendorGuid,
   IN     UINT8            *Data,
   IN     UINTN            DataSize,
-  OUT    UINT32           *CertOffset,    OPTIONAL
-  OUT    UINT32           *CertDataSize,  OPTIONAL
-  OUT    UINT32           *CertNodeOffset,OPTIONAL
+  OUT    UINT32           *CertOffset     OPTIONAL,
+  OUT    UINT32           *CertDataSize   OPTIONAL,
+  OUT    UINT32           *CertNodeOffset OPTIONAL,
   OUT    UINT32           *CertNodeSize   OPTIONAL
   )
 {