HL2_Sound_List - Fix the `remote_yes`sound as the previous one wasn't the correct soundfile. + Spacing problem

Enums/DMG - Hours of research finding out what types of damage certain weapons, entities, and NPCs do, and putting them in subcategories. Along with this major changes to how some previous sentences were worded.

Enums/ACT - Spelling error

Enums/DMG - Fixing a few grammar errors and creating a validity screen