RealTimeClockLib is used to back the runtime services time functions, so
align the description of the function return values with the defined values
for these services as described in UEFI Spec 2.10.
REF: UEFI spec 2.10 section 8 Services ? Runtime Services
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Signed-off-by: Suqiang Ren <suqiangx.ren@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>
dcdc6f8e3f