closes https://github.com/torproject/community/pull/10

close: https://github.com/torproject/community/pull/11

will-fix https://dip.torproject.org/web/tpo/issues/39 partly

Fixes part of https://dip.torproject.org/web/support/issues/39

In particular:

* Use "TODO1" and "TODO2" to make it clear that the OR and the obfs4
  port are separate ports.

* Slightly rephrase comments for selinux commands.

* Fix link to help section.

* Fix subtitle.

Thanks to Wolfgang for pointing out this issue and to egypcio for
confirming that it was indeed an issue.

Fair enough, that all makes sense. I removed all of the Fedora stuff but kept the parts relevant to RHEL / CentOS.

We don't want people to think that the OR port and obfs4 port are
supposed to be the same.  Thanks to Ken Kundert for pointing out this
issue and for fixing it for CentOS/RHEL/OpenSuSE in commit a6a8c359.