Basic structure and content
Tidy, add resource types
Syntax changes
Add example zonefile
Add example /etc/hosts
Add example /etc/resolv.conf
Add PTR documentation
Add more documentation
Forward and reverse DNS documentation
Tidying up
Syntax changes

Based on @miketheman's in-line comments.
All sentences on new lines
Add ICANN link; fix typo
Explain absolute and relative paths
computeri > computer
publically > publicly
Make consistent use of quotes
Clarify 'types of IP'
Fix typo and spacing
Merge pull request #233 from ajlanghorn/dns-101

DNS 101