REF: https://bugzilla.tianocore.org/show_bug.cgi?id=311 The patch is also to refine comments of macros PcdToken and PcdTokenEx. Cc: Liming Gao <liming.gao@intel.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>