MdeModulePkg/Library: Fix typos in comments and variables

MdeModulePkg/Library: Fix typos in comments and variables

- servity -> severity
- TURE -> TRUE
- contiue -> continue
- Pepresentation -> Representation
- suported -> supported
- opints -> points
- sucessfully -> successfully
- hexidecimal -> hexadecimal
- Pacakge -> Package
- Libary -> Library
- successull -> successfully
- reseting -> resetting
- Retrive -> Retrieve
- dirver -> driver
- availible -> available
- chracter -> character
- seperator -> separator

Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>