MdeModulePkg: Refine description a little for PcdEmuVariableNvStoreReserved

MdeModulePkg: Refine description a little for PcdEmuVariableNvStoreReserved

This patch is not related directly to
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1323
Merge EmuVariable and Real variable driver.

PcdEmuVariableNvStoreReserved actually defines the base address of
reserved memory range.

This patch refines description a little for PcdEmuVariableNvStoreReserved.

Suggested-by: Jian J Wang <jian.j.wang@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Tested-by: Julien Grall <julien.grall@arm.com>
Acked-by: Julien Grall <julien.grall@arm.com>