MdePkg AcpiSdt: Update description of AcpiVersion and GetAcpiTable().

Follow PI 1.4 spec,
1. Add EFI_ACPI_TABLE_VERSION_5_0 definition.
2. Update AcpiVersion description in the EFI_ACPI_SDT_PROTOCOL section.
3. Update TableKey parameter description in the
EFI_ACPI_SDT_PROTOCOL.GetAcpiTable() section.
4. Update EFI_ACPI_SDT_PROTOCOL.GetAcpiTable() description.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17648 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed