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/DxeRsa2048Sha256GuidedSectionExtractLib/DxeRsa2048Sha256GuidedSectionExtractLib.c

@@ -123,7 +123,7 @@ EFIAPI
 Rsa2048Sha256GuidedSectionHandler (
   IN CONST  VOID    *InputSection,
   OUT       VOID    **OutputBuffer,
-  IN        VOID    *ScratchBuffer,        OPTIONAL
+  IN        VOID    *ScratchBuffer         OPTIONAL,
   OUT       UINT32  *AuthenticationStatus
   )
 {