Document how to disable the firewall on fedora.
Add a note about the commands not being required on AWS.
Don't explicitly use the FORWARD_direct chain.

Firewalld automatically puts rules in the chain, when the FORWARD chain is requested.
A better explantion.
Spelling.
/images/
Merge pull request #982 from ClusterHQ/disable-firewall-FLOC-1007

Add instructions to disable firewalld on Fedora.