NetworkPkg: 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: Maciej Rabeda <maciej.rabeda@linux.intel.com>

NetworkPkg/Include/Library/HttpIoLib.h

@@ -234,9 +234,9 @@ HttpIoCreateIo (
 EFI_STATUS
 HttpIoSendRequest (
   IN  HTTP_IO                *HttpIo,
-  IN  EFI_HTTP_REQUEST_DATA  *Request,      OPTIONAL
+  IN  EFI_HTTP_REQUEST_DATA  *Request       OPTIONAL,
   IN  UINTN                  HeaderCount,
-  IN  EFI_HTTP_HEADER        *Headers,      OPTIONAL
+  IN  EFI_HTTP_HEADER        *Headers       OPTIONAL,
   IN  UINTN                  BodyLength,
   IN  VOID                   *Body          OPTIONAL
   );

NetworkPkg/Include/Library/NetLib.h

@@ -766,7 +766,7 @@ EFIAPI
 NetDestroyLinkList (
   IN   LIST_ENTRY                       *List,
   IN   NET_DESTROY_LINK_LIST_CALLBACK   CallBack,
-  IN   VOID                             *Context,    OPTIONAL
+  IN   VOID                             *Context     OPTIONAL,
   OUT  UINTN                            *ListLength  OPTIONAL
   );
 
@@ -1237,7 +1237,7 @@ EFI_STATUS
 EFIAPI
 NetLibGetMacString (
   IN  EFI_HANDLE            ServiceHandle,
-  IN  EFI_HANDLE            ImageHandle, OPTIONAL
+  IN  EFI_HANDLE            ImageHandle  OPTIONAL,
   OUT CHAR16                **MacString
   );
 

NetworkPkg/Include/Library/UdpIoLib.h

@@ -207,7 +207,7 @@ EFIAPI
 UdpIoCancelDgrams (
   IN UDP_IO                 *UdpIo,
   IN EFI_STATUS             IoStatus,
-  IN UDP_IO_TO_CANCEL       ToCancel,        OPTIONAL
+  IN UDP_IO_TO_CANCEL       ToCancel         OPTIONAL,
   IN VOID                   *Context         OPTIONAL
   );
 
@@ -360,4 +360,3 @@ UdpIoRecvDatagram (
   );
 
 #endif
-