MinPlatformPkg: Fix spelling errors

"implemenations" should be "implementations"
"beggining" should be "beginning"

Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>