MdeModulePkg: Add missing pcd description to MdeModulePkg.uni
MdeModulePkg: Add missing pcd description to MdeModulePkg.uni

Since PcdHiiOsRuntimeSupport has added in the MdeModulePkg.dec file,
now add the usage information in the uni file.

Cc: Qiu Shumin <a85ffd5e6451a83645d9ceae55f1cb6cdf90c130@intel.com>
Cc: Eric Dong <fa9eeec52367040ac98013bc4b2913db170588f8@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <1e8692d8ed8470b17e8ddd7612a0f029768dcb56@intel.com>
Reviewed-by: Qiu Shumin <a85ffd5e6451a83645d9ceae55f1cb6cdf90c130@intel.com>

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2