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/Bus/Pci/PciBusDxe/PciIo.c

@@ -1854,7 +1854,7 @@ EFIAPI
 PciIoGetBarAttributes (
   IN EFI_PCI_IO_PROTOCOL             * This,
   IN  UINT8                          BarIndex,
-  OUT UINT64                         *Supports, OPTIONAL
+  OUT UINT64                         *Supports  OPTIONAL,
   OUT VOID                           **Resources OPTIONAL
   )
 {
@@ -2084,4 +2084,3 @@ PciDevicesOnTheSamePath (
 
   return (BOOLEAN) (Existed1 || Existed2);
 }
-