NetworkPkg/HttpBootDxe: Fix spelling typo in EFI_HTTP_STATUS_CODE

"HTTP_STATUS_300_MULTIPLE_CHIOCES"
This should instead be:
"HTTP_STATUS_300_MULTIPLE_CHOICES"

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>