UefiCpuPkg: 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: Ray Ni <ray.ni@intel.com>

UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c

@@ -405,7 +405,7 @@ ConvertMemoryPageAttributes (
   IN  UINT64                            Length,
   IN  UINT64                            Attributes,
   IN  BOOLEAN                           IsSet,
-  OUT BOOLEAN                           *IsSplitted,  OPTIONAL
+  OUT BOOLEAN                           *IsSplitted   OPTIONAL,
   OUT BOOLEAN                           *IsModified   OPTIONAL
   )
 {
@@ -1568,4 +1568,3 @@ EdkiiSmmGetMemoryAttributes (
 
   return EFI_SUCCESS;
 }
-