Fix typo at introduction.md
Fix Sponsoring a Server.md
Fix Terms of Service.md

"An" meant to say "And"
Update How to set your NickServ password.md

Replaced ... into , and added ".".
Merge pull request #2 from YenaHong/Proofread

Proofreading, closes #2
Changes to minimize verbosity
Typo fixo
Typo fixo
Merge pull request #3 from flotwig/patch-1

Changes to minimize verbosity
Add rules regarding channel promotion in other channels