FAQ: Add link to RHEL 6.5 preview repository.
FAQ: RHEL 7 is based on libguestfs 1.22.
FAQ: Indent Ubuntu releases in list.
FAQ: RHEL 6.5 will fix the buildnet problem.
FAQ: Put B<> bold section around "Note"s in the text.
FAQ: Emphasize that we don't accept github pull requests.
FAQ: Developer questions about committing and forking.