EmbeddedPkg: 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: Andrew Fish <afish@apple.com>

EmbeddedPkg/Library/PrePiHobLib/Hob.c

@@ -582,7 +582,7 @@ BuildFv3Hob (
   IN          UINT64                      Length,
   IN          UINT32                      AuthenticationStatus,
   IN          BOOLEAN                     ExtractedFv,
-  IN CONST    EFI_GUID                    *FvName, OPTIONAL
+  IN CONST    EFI_GUID                    *FvName  OPTIONAL,
   IN CONST    EFI_GUID                    *FileName OPTIONAL
   )
 {
@@ -846,4 +846,3 @@ BuildMemoryTypeInformationHob (
 
   BuildGuidDataHob (&gEfiMemoryTypeInformationGuid, &Info, sizeof (Info));
 }
-