IntelSiliconPkg/ConfigBlockLib: Add periods in comments

https://bugzilla.tianocore.org/show_bug.cgi?id=2518



ECC need '.' character at the end of line.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
Reviewed-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Sai Chaganty <rangasai.v.chaganty@intel.com>